What is sediment?

• the process of rocks being broken down and carried away
• bits of rock, sand, and silt caused by the weathering of rocks
• the top layer of the soil
• decaying plant or animal material 

Which of these is an example of erosion

• Light Shinning onto a mountain
• Rain breaking down rock 
• Wind blowing away sediment
• All of the above

The diagrams  shows a natural process that weathers rock.
 Which statement best explains why this process results in weathering?

• frozen water acts as a solute
• water expands when it freezes
• the mass of water increases when it freezes
• frozen water dissolves most types of rock

How does freezing water cause the weathering of rocks?  The freezing water—

• keeps the rocks in place
• makes the rocks last longer
• expands cracks and breaks rocks
• causes rocks to fall in landslides

What is the major cause of weathering and erosion to form canyons?

• wind
• ice
• glaciers
• moving water

Wide valley through which a river flows.

• delta
• V-shaped valley
• flood plain
• alluvial fan

A wide, sloping deposit of sediment formed where a stream leaves a mountain range.

• flood plain
• delta
• alluvial fan
• gully

A landform made of sediment that is deposited where a river flows into an ocean or lake.

• delta
• alluvial fan
• flood plain
• oxbow lake

Water that fills the cracks and spaces in underground soil and rock layers.

• stream
• tributary
• groundwater
• rain

Which of the following is NOT an agent of erosion

• Water

• Wind

• glaciers

• ice