1. Objective #7
Describe the composition and structure of the Earth.

2. The Earth as a System Scientists divided this system into four parts:
The Geosphere (rock)
The Atmosphere (air)
The Hydrosphere (water)
The Biosphere (living things)

3. The Earth as a System

4. The Earth as a System
The geosphere is the mostly solid, rocky part of the Earth that extends from the center of the core to the surface of the crust. .

5. Discovering Earth’s Interior

6. Earth’s Layers

7. Objective #8: Describe Plate Tectonics
Tectonic plates are blocks of lithosphere that consist of the crust and the rigid, outermost part of the mantle and glide across the underlying asthenosphere.

8. Where do Earthquakes Occur?

9. Volcanoes: The Ring of Fire

10. Erosion
The Earth’s surface is continually battered by wind and scoured by running water, which moves rocks around and changes their appearance.
Erosion is the process in which the materials of the Earth’s surface are loosened, dissolved, or worn away and transported form one place to another by a natural agent, such as wind, water, ice or gravity.

11. Tectonic Plates