Soil is a type of ____________.

• rocks
• sand
• sediment
• dirt

rocks are broken down by________.

• wind
• weathering
• erosion
• man

Sand and soil were once________.

• rock
• sediment
• erosion
• weathering

Sediment is moved by__________.

• weathering
• man
• wind
• erosion

Rain breaks down rocks by

• weathering
• erosion

The growth of plant roots and animal activity may result in ________________.

• erosion
• mechanical weathering
• chemical weathering
• abrasion

The major source of erosion is _________________.

• wind
• ice
• moving water
• snow

Which process is increasing between Stage 1 and Stage 3?

• Erosion
• Weathering
• Deposition
• Abrasion

How would a fast-flowing river be most likely to move sand-sized particles of sediment?

• It would lift them and carry them downstream.
• It would dissolve them completely in solution.
• It would roll or slide them along the streambed.
• It would deposit them on the streambed.

The process that breaks down rocks and other materials on Earth's surface is called

• Weathering
• Erosion
• Deposition
• Decomposition