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