| Physical Weathering |
| #1 |
True or False: Physical weathering causes rocks to change size and shape. |
True |
| #2 |
There are 4 causes of physical weathering. What has caused this rock to crack?  |
Freezing and thawing (Water enters the small cracks in rocks, freezes, and then expands. This causes the cracks to widen.) |
| #3 |
There are 4 causes of physical weathering. What has caused Half Dome's layers to peel off like the layers of an onion?  |
Exfoliation (Layers of heavy rock wear away. You can see many layers of the rock.) |
| #4 |
There are 4 causes of physical weathering. What caused this sidewalk to break apart? |
Plants or roots (A tree's roots force their way in rock. The roots grow, and the cracks widen and break the rock apart.) |
| #5 |
There are 4 causes of physical weathering. What caused this rock arch to form? |
Abrasion (Winds carry bits of sand that break apart the soft part of rocks.) |
| Chemical Weathering |
| #1 |
True or False: Chemical weathering is caused by freezing and thawing, exfoliation, abrasion, or plants. |
FALSE. Chemical weathering occurs when the minerals in rocks chemically react with oxygen, acids, or carbon dioxide. |
| #2 |
There are 3 causes of chemical weathering. Water and ________ mixed to create rust on this rock.  |
Oxygen (Oxygen + Water + Iron = Rust) |
| #3 |
There are 3 causes of chemical weathering. Water and _______ gas form carbonic acid which caused this limestone cave to form.  |
Carbon dioxide (Carbonic acid forms when carbon dioxide and rain water mix together. It reacts with minerals in rocks.) |
| #4 |
There are 3 causes of chemical weathering: Decaying plants put ________ in soil. This causes rocks to break down and look like this:  |
Acids (Water soaking into soil disssolves acids that react with the minerals in rocks.) |
| #5 |
How is chemical weathering different than physical weathering? |
Chemical weathering changes the minerals that make up a rock. Physical weathering does not-- it only changes the shape and size of rocks. |
