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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)