Name

The breaking down of the materials of the Earth's crust into smaller pieces or particles is called ___________.

• erosion
• weathering

Which of the following occurs when plant roots grow in the rocks over a long period?

• physical weathering
• chemical weathering

Oxygen and moisture in the air react with iron to form __________.

• 
• 

Which of the following best describes how water is an example of physical weathering

• Water can affect pieces of rock, causing the pieces to get smaller and smaller.
• The water evaporates from the Earth's surface and forms clouds.

Physical weathering can also be caused by the wind.

• true
• false

Which of the following best describes an example of how temperature can cause physical weathering?

• Water evaporates from Earth's surface and condenses high up in the sky.
• When water freezes, it expands and cause cracks in them.

Which of the following can also cause physical weathering?

• 
• 

A small stream or other source of flowing water cannot form a canyon.

• true
• false

Which of the following can contribute to physical weathering?

• 
• 
• both Earthworms and Groundhogs