Explain why it was helpful for scientists to compare substrate samples in the arson case discussed in the video. (Forensic Science PBS Video)
Answer:
Because soil analysis can indicate the existence of flammable substances. Which indicates that the fire was caused by someone in a criminal manner.
Explanation:
As we know, the soil represents the surface layer of the earth where the plants are fixed and remove the nutrients they need to survive.
The soil is formed through the weathering of the rocks having the minerals that its original rock has. The soil has no flammable substance, as it is basically made up of sand, clay and silt. In addition, the soil is a porous environment, which allows any liquid released onto it to infiltrate at a considerable speed.
For this reason in the investigation of a criminal fire, the analysis of soil samples can be very useful. This is because soil analysis can indicate the presence of some flammable substance that has infiltrated. This can confirm that the fire was provoked and was criminal.
Question on edmentum: Type your response in the box.
The video discussed the idea of a self-contained city. Pick a solution mentioned in the video and explain why it will help cities achieve the goal of self-containment.
sample Answer:
A self-contained city can sustain itself and its resources. It does not take more than it needs. Every object can be either reused or recycled productively. One of the people in the video gave the example of compacting and forming trash into different shapes, which can support archways and foundations. This would reduce dependence on the natural resources used for construction, and it would also support recycling.