Final revision

   Earthquakes happen when layers of ……………………….push against each other.

• rocks

• food

……………………….makes the soil loose and cause the land to slip downhill.

  ……………………….comes out of the crater when the volcano goes off.

  ………………………. is the breaking up of rock.

The plant ……………………….helps hold the soil in place.

  (      ) River drop sand, soil, and small rocks at deltas.

• true

• false

(      ) Maps are sudden shaking of the ground.

• true

• false

(      ) Volcanoes are mountains that have a hole on top called crater.

• true

• false

(      ) A flood happens when there is no rain.

• true

• false

(      ) Mountains can be hundreds to thousands meters tall.

• true

• false