1. Question 1 What is the biosphere?
The earth system that contains all living things

2. Question 2 Does the biosphere have clear boundaries?
No, because it is found within other Earth systems including air, water, and soil.

3. Question 3 What is the atmosphere?
The mixture of gases that forms a layer around Earth

4. Question 4 What two gases make up most of the atmosphere?
Nitrogen and Oxygen

5. Question 5 Where does most weather occur in the atmosphere?
In the troposphere

6. Question 6 What is the hydrosphere?
The system that contains all of Earth’s water

7. Question 7 What is the geosphere?
The solid part of Earth
Dirt, soil, volcanoes, mountains, the ocean floor

8. Question 8 What are the main layers of the geosphere?
The crust, mantle, and core