Earth's Layers

Answer Key - Grade 3 Science Worksheet

Write the layer of Earth: crust, mantle, outer core, or inner core.

1. 1.

   If you could dig straight down, this layer would be the last one you reach. Layer: inner core

2. 2.

   This is the thickest layer, made of hot, slowly moving rock. Layer: mantle

3. 3.

   Mountains, oceans and cities are all on this layer. Layer: crust

4. 4.

   This layer is hot enough that rock in it can slowly flow. Layer: mantle

5. 5.

   This layer is the thinnest, like the skin of an apple. Layer: crust

6. 6.

   This is the hottest layer, and it stays solid because of the great pressure. Layer: inner core

7. 7.

   This layer is made of melted iron and nickel. Layer: outer core

8. 8.

   This layer is about as hot as the surface of the Sun, yet it is solid. Layer: inner core