A natural feature on Earth's surface, such as a mountain, a valley, or a canyon.
What is a landform?
100
The process by which weathered rock is picked up and moved to another location.
What is erosion?
100
The material in which most plants grow.
What is soil?
100
The force that pulls pieces of rock downhill.
What is gravity?
200
They cause cracks in Earth's surface.
What is an Earthquake?
200
The sudden movement of rocks and soil down the side of a hill.
What is a landslide?
200
An opening in Earth's surface that lets hot, melted rock and gases escape.
What is a volcano?
200
A huge sheet of ice that moves slowly over land.
What is a glacier?
200
A shaking of the ground that happens when rock breaks and moves suddenly.
What is an earthquake?
300
Plants cause weathering. The ______ can grow into cracks in rocks. As the ______ become larger, they push on the rock and may break it apart.
What are roots?
300
Sand and pebbles carried by moving ______ also weather rock. On the rocky coast, ocean waves break down rock cliffs in this way.
What is water?
300
_____ and _____ can carry sand and other small pieces of rock.
What are wind and water?
300
Rainwater can seep into cracks in the rock and in the winter the water may freeze. It then expands or takes up more space. The ice in the cracks pushes against the rock. Over time, repeated freezing and thawing of water may split the rock apart. This is called _____ _________.
What is ice wedging?
300
A force that pulls objects toward each other.
What is gravity?
400
The ____, _____ and sometimes ______ work together to weather rock.
What are the wind, water, and plants?
400
Over long periods of time, __________ breaks rocks into smaller and smaller pieces.
What is weathering?
400
Small pieces of rock, along with material from living things, make up ____. It is the material in which most plants grow.
What is soil?
400
The activities of _______ can speed up erosion. _______ and ______ dig burrows and tunnels in the ground. Then the rain can wash the soil away more easily.