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23 Cards in this Set
- Front
- Back
When water gets into the crack of a rock, it freezes, expands, and makes the crack bigger. We call this....
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frost wedging
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When rocks break down without their composition changing, they have undergone ____ weathering.
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mechanical
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When rocks break down and become new substances as a result of it, then they have undergone ____ weathering
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chemical
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When soil is removed from the top of a large rock underground, the rock pushes upward and exfoliates into smaller rocks. This mechanical weathering is called....
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unloading
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A pile of weathered rocks is called...
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talus
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When a rock breaks into smaller rocks, then its surface area....
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increases
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When surface area of rock increases, then the rate of weathering....
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increases
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Unloading produces large rock formatations called....
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domes
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When unloaded rock breaks off in sheets, we call it...
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exfoliation
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Mechanical weathering by tree roots is a type of weathering by b_____ a_____.
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biological activity
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The most important agent of chemical weathering is...
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water
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The acid that forms when carbon dioxide combines with water is called...
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carbonic acid (which is what is found in soft drinks)
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Air pollutants NOx and SOx combine with water to make ___ and ___ acids
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sulfuric
nitric |
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Spheroidal weathering is weathering at the ___ of rocks, which makes them rounded-off.
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edges and corners
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In areas of the world where temperatures are warm and there's a lot of rain, then weathering occurs....
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faster
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Mass movement is when soil and rock move downhill by way of...
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gravity
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Saturation with water, oversteepening of slopes, removal of vegetation, and earthquakes are all triggers for ....
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mass movement of soil and rock
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When rocks or fragments fall through the air (as from a cliff) we call this mass movement a ...
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rockfall
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When large blocks of rock slide down a flat slope, we call this mass movement a....
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rockslide
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The downward movement of soil on a curved surface is called....
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slump
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Fast mass movements of soil with lots of water are called...
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mudflows
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Slow mass movements of soil over a short distance without lots of water are called...
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earthflows
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A very slow downhill mass movement caused mostly by frost action is called ____. It is sometimes seen to move old gravestones.
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creep
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