Plate Tectonics
Across
- 2. The crust is the outermost layer of the earth. Compared to the other layers, the crust is very thin and cold.
- 4. The circular movement of a liquid or a gas as it heats. It is believed that convection currents are what moves continental plates.
- 6. Tectonics The theory that states that the earth’s crust is made of large sections, or plates.
- 7. The mantle is the middle layer of the earth. The mantle is made of liquid and solid rock that moves and churns.
- 8. The large landmass that existed millions of years ago. It broke up to form today’s continents.
- 9. Areas where plates move toward each other and collide.
Down
- 1. where plates essentially grind past each other with no subduction.
- 3. These happen when 2 plates move away from each other. When this happens lava has room to come up through the cracks and form new crust.
- 4. The theory that the earth’s continent s used to be joined as a single, large landmass called Pangaea. Pangaea started breaking up millions of years ago. The continents slowly moved to their present positions.
- 5. The core is the center of the earth. It is made of solid iron and nickel, surrounded by melted iron and nickel.