Question

question 9
1 pts
which is false about the atmosphere?
it helps keep the planet at a suitable temperature for life
it protects inhabitants from harmful radiation from the sun.
it is necessary for respiration.
it is composed of 78% oxygen and 21% nitrogen.
question 10
1 pts
in what field to scientists study the processes that change earth’s composition?
geochemistry
paleontology

Explanation:

For Question 9:

• The atmosphere's greenhouse effect regulates planetary temperature for life.
• The ozone layer blocks harmful solar radiation.
• Atmospheric oxygen is critical for aerobic respiration.
• The atmosphere is ~78% nitrogen and ~21% oxygen, not the reverse.

For Question 10:

• Geochemistry focuses on Earth's chemical composition and changing processes.
• Paleontology studies ancient life forms, not Earth's compositional processes.

Answer:

Question 9: It is composed of 78% oxygen and 21% nitrogen.
Question 10: geochemistry