1. A movement of the ground, caused by a sudden release of energy in Earth's crust.
earthquake

2. The point on Earth's surface directly above the focus of an earthquake.
epicenter

3. erosion
The process of wearing away and moving sediment by wind, moving water, or ice.

4. fault
A break in Earth's crust.

5. A wall-like structure that sticks out into the ocean to prevent sand from being carried away.
jetty

6. landform
A natural land shape or feature.

7. Molten (melted) rock that reaches Earth's surface.
lava

8. Molten (melted) rock beneath Earth's surface.
magma

9. A section of Earth's crust and mantle that fits together with other sections like puzzle pieces.
plate

10. An area of new land at the mouth of a river, formed from sediments carried by the river.
delta

11. A hill of sand, made and shaped by wind.
Sand dune

12. A large hole formed when the roof of a cave collapses.
sinkhole

13. All the kinds of landforms in a certain place.
topography

14. The process of wearing away rocks by natural processes.
weathering

15. A mountain made of lava, ash, or other materials from eruptions that occur at an opening in Earth's crust.
volcano