All vocabulary you need to know and understand in terms of the process of weathering.
Terms in this set (12)
The breakdown of rock material
Physical (Mechanical) Weathering
Rocks are broken up into fragments; does not change the composition of the rock but it does create more
. The dominant climate condition for this type of weathering is cold and moist.
Occurs on the surface of rocks and changes the composition of the material. This causes rocks to weaken and makes it easier for them to break apart (physical weathering). Dominates in warm moist climates.
Occurs in climates with freezing and thawing temperatures; water gets into cracks and creases of rock. Water expands when it freezes and causes cracks in rocks to get bigger and break apart. Ex: pot holes.
Iron atoms combine with oxygen to form iron oxide (rust).
Surface of the rock "peels" off. Unloading - caused by uplift and exposure of rock that was once deep underground and decreases pressure on rocks.
Roots grow into and under rocks and pry them apart causing cracks to get bigger. Ex: cracks in the sidewalk.
Carbonic acid in rain causes minerals to dissolve. Ex. marble gravestones.
Water weakens the rock and the rock crumbles. Ex: feldspar becomes clay.
Bumping and breaking up of rocks as the collide. Rocks become
smaller, rounder and smoother.
Although pieces of rock continue to get smaller each time a rock breaks apart,
more surface is exposed and surface area increases
. Surface area refers to the amount of the material exposed.
Factors That Affect Weathering
Climate, Exposure, Composition