4th External Forces

The agents of which type of weathering include water, oxygen, carbon dioxide, living organisms, and acid rain?

• mechanical weathering

• erosion

• chemical weathering

• soil

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.

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

• Weathering
• Erosion
• Deposition
• Decomposition

Which of these is an example of erosion?

• Light shining onto a mountain.
• Rain breaking down rocks on a mountain into smaller pieces. 
• Wind blowing away sediment to a new place on the mountain.
• All of the above.

The process by which water, ice, wind, or gravity moves weathered rock and soil from one place to another.

• Weathering
• Erosion
• Deposition
• Crop Rotation

Layers of sediment forming at the bottom of the ocean floor is an example of

• Weathering
• Erosion
• Deposition
• Awesome Science

How do plants weather rocks?

• During photosynthesis
• When roots grow into cracks of rocks and expand the rock breaks.
• When the plant moves water from the roots to the leaves, the rock breaks.
• Plants don't weather rocks.

This student is blowing sand from one part the the pan to another demonstrating ________ to the class.

• erosion

• weathering

• how soil is formed

• deposition

Which statement is NOT and example of chemical weathering?

• acidic water moving through rocks reacts with the minerals

• frost wedging

• iron-containing rocks react with water and oxygen in environment

• lichens, the soil formers, slowly eat away the surface of rocks

The movement that occurs during mass wasting is caused by what? 

• Wind
• Gravity 
• Ice 
• Water