Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
12 Cards in this Set
- Front
- Back
weathering
|
-breaking down of rocks
|
|
physical weathering
|
-happens when things like wind and rain break rocks down
-causes rocks to simply change size and shape, but chemicals do not change |
|
chemical weathering
|
-when a rock breaks down and minerals in the rock are changed
-oxygen, acids, and carbon dioxide can react with the minerals in rocks and cause this |
|
horizons
|
-layers of soil that form over time
-each has its own properties and they differ from place to place |
|
expand
|
-takes up more space, like when water freezes, which can cause cracks in rocks
-causes physical weathering |
|
thaw
|
-to melt (repeated freezing and thawing can break rocks apart)
-causes physical weathering |
|
exfoliation
|
-where outer layers of a rock peel off like the layers of an onion
-this is a form of physical weathering |
|
abrasion
|
-wearing away of rock by blowing sand (can break down softer parts of rocks)
-causes physical weathering |
|
Causes of physical weathering
|
-expanding (water freezing and thawing), exfoliation, and abrasion
|
|
Causes of chemical weathering
|
-Minerals in rock react with oxygen, acids, and carbon dioxide
|
|
carbonic acid
|
-Carbon Dioxide, a gas in air, combines with rainwater
-can cause limestone to form -weathers rocks in soil |
|
humus
|
-decayed plant or animal material
-(part of horizons - layering of soil) |