1. CHAPTER 3 LESSON 1
PLANET EARTH

2. 3.1 INFORMATION

5. A. WHAT IS EARTH?
Scientists divide Earth into four systems that all interact with each other.

6. 4 SPHERES – GIO AND BIO

7. 4 SPHERES – GIO AND BIO

8. 4 SPHERES – HYDRO & ATMO

9. ATMOSPHERE
Surrounding the planet is an invisible layer of gases, which is Earth’s outermost layer.

10. HYDROSPHERE
The liquid layer is made of Earth’s water, some of which is salty and some of which is fresh.

11. GEOSPHERE
Earth’s largest system is the solid material, which is made up of a thin layer of soil covering a large sphere of rock.

12. BIOSPHERE
The biosphere is Earth’s system containing all the living things on the planet.

13. BIOSPHERE
The biosphere has no clear boundaries because it is found within each of the other three systems of Earth.