You may need to conduct your own research to answer the following questions.

Extension Question 1

Explain why there is minimal movement of air between the different layers of the atmosphere.

Extension Question 2

How does the chemical composition of Earth’s core differ from the lithosphere?

Extension Question 3

What is unique about each of Earth’s main spheres compared to other planets in our solar system?

• The lithosphere

• The hydrosphere

• The atmosphere

• The biosphere