The Sun, about halfway through its life span, uses hydrogen for fusion to produce energy. At its current rate, it has enough hydrogen for approximately another 5 billion years. Therefore, we won't worry about the Sun running out of hydrogen in our lifetime or for many millions of lifetimes thereafter.
Explanation:The Sun is believed to be halfway through its main sequence stage, during which nuclear fusion reactions in its core fuse hydrogen to form helium. These reactions release a tremendous amount of energy, which we see and feel as sunlight. Given that the Sun is about 4.6 billion years old, scientists predict that the Sun will run out of hydrogen for fusion in approximately another 5 billion years.
Every second, the Sun converts about 600 million tons of hydrogen into helium. Despite these massive numbers, because the Sun's mass is predominantly hydrogen, and because the rate of fusion is tempered by the thermal gas pressure and the Sun's equilibrium, this hydrogen supply will last billions of years. The process is incredibly efficient, but eventually, the hydrogen fuel in the core will run out. When this happens, the Sun will exit its main sequence stage and enter the red giant phase.
Thus, we won't need to worry about our Sun running out of hydrogen for fusion in our lifetime, or for many millions of lifetimes to come. However, this knowledge helps us understand the life cycle of stars and the future of our solar system.
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The Sun will continue to fuse hydrogen for another 4 to 5 billion years.
The Sun has been undergoing nuclear fusion for approximately 5 billion years, converting hydrogen into helium in its core.
It is expected to continue this process for another 4 to 5 billion years. At that point, the Sun will have exhausted the hydrogen in its core and will begin its red giant phase.Currently, the Sun consumes around 600 million tons of hydrogen per second, converting about 4 million tons of that mass into energy. Once it depletes its hydrogen, it will expand significantly, possibly engulfing the orbits of Mercury, Venus, and possibly Earth, and will start fusing helium into carbon. Eventually, the outer layers will be ejected to form a planetary nebula, leaving a white dwarf at the core to cool and fade over billions of years.All of the following are enacted to limit the amount of goods allowed into a country except __________. A. quotas B. sanctions C. tariffs D. free trade agreements
Answer:
the answer to this question is D
Explanation:
Answer:
the answer is d
Explanation:
i passed the quiz
16. The planet most noted for its rings is A. Venus. B. Saturn. C. Mercury. D. Neptune.
1. in which region of Africa will you find countries whose national languages include French, Spanish, and Portuguese?
A. South Africa
B. West Africa
C. North Africa
D. East Africa
2. (blank) and (blank) are the two most widespread religions in Africa.
A. Christianity/Islam
B. Hinduism/Islam
C. Christianity/Traditional African Religions
D. Islam/Traditional African Religions
3. which statement is true regarding African languages and ethnic groups?
A. all ethnic groups speak only traditional African languages.
B. there are very few ethnic groups in Africa, but there are many languages.
C. there are an estimated 3,000 languages in 3,000 ethnic groups in Africa.
D. there are many ethnic groups but only a few languages.
4. which religion swept across North Africa as a result of trade with the Middle East?
A. Islam
B. indigenous animist religions
C. Hinduism
D. Christianity
5. which statement is false regarding languages spoken in Africa?
A. German is a common language spoken in Southern and East Africa.
B. Swahili is a common language spoken in Tanzania.
C. Arabic and French are commonly spoken languages in North Africa.
D. Spanish is a Common Language throughout Southern portions of Africa
6. which example below is not an example of a traditional African religious practice or belief?
A. belief in ancestral spirits.
B. the idea of sacrifice.
C. belief in Christian principles from the Bible.
D. belief in one God above a host of lesser gods.
7. the largest civilization in Africa developed
A. in the tropical rainforest of Africa.
B. on the island of Madagascar.
C. in the southernmost regions of Africa.
D. along the coast and river valleys of Africa.
8. the term Islam means
A. submission to the worldly possessions.
B. submission to God's will.
C. submission to any ancestral spirits.
D. submission to Christian principles outlined in the Bible.
9. pre-european African society relied heavily on the use of indentured servants, which are people who
A. we're not paid for their labor.
B. we're paid but not given the opportunity to buy back their freedom.
C. we're paid and given the opportunity to purchase their freedom.
D. we're paid desirable bounce of money for their strenuous work
10. the terms tribe and ethnic group are very similar in meaning because
A. both terms involve shared kinship, language, and territory.
B. both terms involve identical physical traits, language, and way of dress.
C. both terms involve shared kinship, Collective loyalty, and identical physical traits.
D. both terms are only used when describing the African population.
In West Africa, countries have national languages that include French, Spanish, and Portuguese. Christianity and Islam are the two most widespread religions in Africa. There are an estimated 3,000 languages in 3,000 ethnic groups in Africa.
Explanation:The region of Africa where you can find countries whose national languages include French, Spanish, and Portuguese is West Africa.The two most widespread religions in Africa are Christianity and Islam.The statement that is true regarding African languages and ethnic groups is that there are an estimated 3,000 languages in 3,000 ethnic groups in Africa, which makes option C correct.The religion that swept across North Africa as a result of trade with the Middle East is Islam.The statement that is false regarding languages spoken in Africa is that German is a common language spoken in Southern and East Africa. The correct option is A.An example that is not an example of a traditional African religious practice or belief is belief in Christian principles from the Bible. Option C is correct.The largest civilization in Africa developed along the coast and river valleys of Africa.The term Islam means submission to God's will.Pre-European African society relied heavily on the use of indentured servants, who were not paid for their labor. Option A is correct.The terms tribe and ethnic group are very similar in meaning because both involve shared kinship, language, and territory. Option A is correct.Learn more about Africa here:https://brainly.com/question/19811262
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On earth, the four major spheres interact as a system. which of these spheres are absent, or nearly absent, on the moon? based on your answer, identify at least five processes that operate on earth but not on the moon ...
The Moon lacks significant atmosphere and hydrosphere spheres, leading to the absence of processes such as weathering, the water cycle, atmospheric circulation, biological processes, and photosynthesis that are present on Earth.
On Earth, the four major spheres that interact as a system are the biosphere (life), the lithosphere (land), the hydrosphere (water), and the atmosphere (air). These spheres are interconnected and have a complex relationship, where alteration in one sphere can impact the others.
On the Moon, two of these spheres are absent or nearly absent. The Moon lacks a significant atmosphere, which is why there is no air to breathe or wind. Also, the Moon does not have a hydrosphere; there are no bodies of liquid water such as lakes, rivers, or oceans. Due to the lack of atmosphere and hydrosphere, several processes that occur on Earth do not happen on the Moon.
Weathering and erosion - Without an atmosphere and hydrosphere, the geological processes of weathering and erosion by water or air do not occur.Water cycle - The absence of water bodies and atmosphere prevents the occurrence of evaporation, condensation, or precipitation cycles.Atmospheric circulation - There are no wind patterns or climate systems due to the lack of atmospheric gases.Biological processes - Without an atmosphere or liquid water, life as we know it cannot exist, so there are no biological cycles or ecosystems.Photosynthesis - With no plant life, there is no photosynthesis or oxygen production.
Cutting “steps” or terraces into the sides of hills is one way to __________.
A.
increase arable land for farming
B.
decrease the risks of flooding
C.
store water during times of drought
D.
decrease agricultural yields
natives would cut terraces into the sides of hills to give themselves the ability of vertical farming. this only adds arable land for farming and would never decrease agricultural yields alone. thus the answer is a. brainliest?
Answer:
The answer is A
Explanation:
Because I love you all and love giving thanks
Somalia Angola India Australia which does not belong
Which answer choice correctly states the historical relationship between the Zapotec and maya civilizations?
Answer: the zapotec and maya civilizations flourished and declined in nearby regions at roughly the same time
Explanation: apex
all of the following are examples of forced migration due to government-imposed expulsion, except __________. A. British prisoners being shipped to Australia B. millions of Africans being relocated to the Americas as a result of the transatlantic slave trade C. Jews in Nazi Germany being relocated D. Irish moving to America during the Potato Famine
Which of the following has been proposed as a potential strategy for mitigating the increase of co2 in the atmosphere ?
- add aerosol to the atmosphere
- inject into geologic formation
- add iron to the ocean to increase phytoplankton
-shoot it into space
- all of the above
The distinctive lava flow pattern in erta ale's crater is important because it is similar to the processes occurring deep inside the earth. the repetitive process whereby magma rises from the mantle, cools and solidifies, and then sinks and liquefies is called __________.
Final answer:
The repetitive process whereby magma rises from the mantle, cools and solidifies, and then sinks and liquefies is called magmatic differentiation. This process is responsible for the distinctive lava flow pattern in Erta Ale's crater.
Explanation:
The repetitive process whereby magma rises from the mantle, cools and solidifies, and then sinks and liquefies is called magmatic differentiation. This process is important because it is similar to the processes occurring deep inside the earth and is responsible for the distinctive lava flow pattern in Erta Ale's crater.
Magmatic differentiation results in the formation of different types of magma with varying compositions and viscosities, which in turn can produce different types of volcanic eruptions and lava flows.
The stratospheric ozone ( o 3 ) layer helps to protect us from harmful ultraviolet radiation. it does so by absorbing ultraviolet light and falling apart into an o 2 molecule and an oxygen atom, a process known as photodissociation. o 3 (g)→ o 2 (g)+o(g)
The stratospheric ozone layer located in the earth's upper atmosphere absorbs harmful ultraviolet radiation from the sun, breaking into an O2 molecule and a single oxygen atom. This protective layer has been depleted by man-made emissions of chlorofluorocarbons (CFCs), leading to efforts to phase out such harmful substances and halt further depletion.
Explanation:The stratospheric ozone (O3) is a form of oxygen that resides in the stratosphere, a layer of the atmosphere extending from about 10 to 50 kilometers above the earth's surface. This ozone layer is essential for life on Earth as it absorbs the harmful ultraviolet radiation from the sun through a process called photodissociation. In this process, O3 absorbs UV light and breaks down into an O2 molecule and a singular oxygen atom: O3 (g) → O2 (g) + O(g).
In the 1980s, it became clear that human activities, specifically the production of chlorofluorocarbons (CFCs), were depleting this critical ozone layer. This discovery sparked international action, leading to the phase-out of CFCs in industrial applications. As a result, there has been a halt in the loss of atmospheric ozone, and the well-known "ozone hole" over the Antarctic is gradually shrinking.
Ozone's role in absorbing UV radiation is pivotal as it prevents the potential cell damage that UV light can cause on Earth. Without the ozone layer, the harmful effects of UV radiation, such as increased cases of skin cancer and other health risks, would be more prevalent.
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What will happen to sea levels when large amounts of water is stored in ice sheets and continental glaciers?
True or false Mexico is an important all producing country
The land circled on the map above can best be described as __________.
A.
suitable for cattle ranching
B.
suitable for crop farming
C.
generally unproductive land
D.
suitable for dairying
The land circled on the map above can best be described as generally unproductive land. Hence, option C is correct.
What is unproductive land?Unproductive land refers to terrain, including wetlands, that is inaccessible or impractical to harvest agricultural or forest goods due to its location or because it is by nature incapable of producing agricultural or forest products because of inadequate soil or site features.
Unproductive soils for broadacre farming are those that lack the physical and/or chemical properties necessary to reliably produce economic yields of crops and pastures.
A situation when water is cleared from the soil so slowly that it periodically becomes saturated during the growing season or stays wet for extended periods of time longer than seven days.
Thus, option C is correct.
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What geographic feature limited the northward expansion of the Maurya and Gupta empires?
A) Ganges River
B) Himilayas
C) Deccan Plateau
D) Thar Desert
The answer is b, I took a test with this
which of the following mountain ranges found in the united states is highly eroded?
1. Rocky Mountains
2. Sierra Nevada range
3. Cascade Mountains
4. Appalachian Mountains
Answer:
4
Explanation:
Number 4 represents the Appalachian Mountains. They stretch over 2,000 miles long and are the oldest mountain range in North America. They are over 400 million years old.
In what ways are the sierra nevada mountains and the andes mountains the same in terms of mountain formation?
Answer:
hi
Explanation:
First the are both in America, Sierra nevada in North america and the Andes in South america.
Fold mountains
These are the most common type of mountain. As two plates move towards each other they buckle and the crust pushes upwards, forming a mountain. Fold mountains are generally formed between 40- 50 million years ago, which is geologically-speaking, young. They are often high with steep faces. Examples of fold mountains include The Himalayas, The Andes, The Rockies and The Alps.
The Andes: The Andes Mountains are located in South America, along the western coast of the continent and stretch 7000 km. They extend from north to south through seven South American countries: Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile, and Argentina.The highest peak in South America, at 6962 metres, is Mount Aconcagua, which is part of the Andes range. The Andes were formed when the Nazca plate collided with the South American plate.
Fault block mountains
These are formed when two plates move towards each other. Rather than the crust folding under the pressure of the moving plates, it cracks along lines of weakness called fault lines. The crust then breaks into blocks, which are pushed upwards.
The Sierra Nevada: An example of fault block mountains is the Sierra Nevada mountain range in California, USA. The range is located in eastern California and stretches for 640km. The highest peak of the Sierra Nevada is Mount Whitney, at 4418 metres. The mountains are primarily composed of granite. The Sierra Nevada range was the site of the American gold rush in the 1840s.
Which hazard generated by earthquakes can be destructive many hundreds of kilometers away from the epicenter?
What is the answer??? I've been stuck on it for a while it would help out
Which two locations are found in the same major geographic landscape province?
1. Albany and Old Forge
2. Elmira and Riverhead
3. Jamestown and Slide Mountain
4. Massena and Mt. Marcy
Answer:
3. Jamestown and Slide Mountain
Explanation:
The physical geography of the USA is variated and complex, for this reason, geologists have divided the country into 12 major Landscape provinces depending on common geological characteristics and physical properties ( Flatland, mountains, etc). But a further division inside each province is made to be able to analyze each province with higher detail at lower scales. In The Case of the east coast, the major landscape province is the Appalachian plateau containing states on the west of the Appalachian mountains, including New York ( Slide Mountain located in Catwalk subdivision) and West Virginia ( Jamestown location).
Many people have settled in central Mexico instead of the eastern or western portions of the country. What physical feature keeps people away from the eastern and western portions of Mexico? Whoever Answers first gets 10 points and Brainliest answer. BTW, Here are the Answer Choices. A) deserts B) marches C) mountains D) rivers
Answer:
c) Mountains
Explanation:
Sierra Madre, mountain system of Mexico. It comprises of the Sierra Madre Occidental (toward the west), the Sierra Madre Oriental (toward the east), and the Sierra Madre del Sur (toward the south). These ranges encase the great central Mexican Plateau, which itself is a piece of the framework—despite the fact that the northern segment of the level likewise is viewed as a component of the Basin and Range Province in the United States—and is broken by squares of mountain extents and substantial vaporous waste bowls called bolsones ("pockets").
Which layer of the atmosphere holds the most water vapor?
How does the tropical climate of the Amazon River Basin MOST LIKELY affect vegetation?
A) High temperatures make the soil too dry.
B) Heavy rainfall produces a wide variety of plants.
C) Heavy rainfall prevents many plants from growing.
D) High temperatures in the summer kill many plants.
What is the seaport city in the country of spain?
Referring to the arizona geologic map: what is the symbol for the oldest rocks on the map?
which governor of an early North American colony negotiated treaties with local Native Americans?
Answer:
William Penn negotiated treaties with local Native Americans
if jk lm which statement is true?
i forgot the exact wording of the answer but it had the number 90 in it. I know that doesn't help but its better then i dont know what your asking
Answer:
JK and LM meet at a 90 degree angle
Explanation:
In what areas is the outermost layer of the earth the thinnest?
On a graph, an equilibrium point is where a supply curve and a demand curve meet. a supply curve is higher than a demand curve. the supply and demand curves head up. the supply and demand curves head down.
The correct answer is - a supply curve and a demand curve meet.
An equilibrium, from an economical perspective, in essence means that the supply and demand for a product or service are equal.
This would basically mean that the amount that is produced of some good is the totally same amount that is demanded and all of it will be sold, without having any surplus, or be lacking in quantity.
The price in an equilibrium situation is defined by the point in which the supply and demand curves intersect.
Answer:
Its A
Explanation:
Which decreases beach erosion without the construction of protective structures
A. groin
B. beach nourishment
C. seawall
B. breakwater