The process of water freezing thawing and freezing again in the crack of a rock is called?

Question

its either wind erosion tectonic forces mechanical weathering or chemical wheathering?

Answer 1

Mechanical or physical weathering. 'Mechanical' or 'Physical' weathering involves the breakdown of rocks and soils through direct contact with atmospheric conditions such as heat, water, ice and pressure.

Freeze-thaw action , sometimes known as ice crystal growth, ice wedging, frost wedging, frost action occurs when water in cracks and joints of rocks freeze and expand.

Freeze-thaw action occurs mainly in environments where there is a lot of moisture, and temperatures frequently fluctuate above and below freezing point—that is, mainly alpine and periglacial areas.

When water that has entered the joints freezes, the ice formed strains the walls of the joints and causes the joints to deepen and widen. This is because the volume of water expands by 9% when it freezes.

When the ice thaws, water can flow further into the rock. When the temperature drops below freezing point and the water freezes again, the ice enlarges the joints further.

Repeated freeze-thaw action weakens the rocks which, over time, break up along the joints into angular pieces. The angular rock fragments gather at the foot of the slope to form a talus slope (or scree slope). The splitting of rocks along the joints into blocks is called block disintegration. The blocks of rocks that are detached are of various shapes depending on their rock structure.

Ice crystals can also form in the pore spaces of rocks. They grow larger as they attract water that has not frozen from the surrounding pores. The ice crystal growth weakens the rocks which, in time, break up. An example of rocks susceptible to frost action is chalk, which has many pore spaces for the growth of ice crystals.

Answer 2

Mechanical weathering. Tectonics is the movement of continents; wind erosion is caused by wind buffeting rocks with grains of sand; chemical erosion occurs when aciditic or sulphuric substances eat away at rocks--Luray Caverns in West Virginia is an example of how chemicals affect rocks.

Answer 3

This question belongs in the Science & Mathematics: Earth Science & Geology category.

Answer 4

It's mechanical weathering. When it happens on the surface (typically a driving surface), it's referred to as a "frost heave."

Answer 5

Isn't just another form of erosion?

Answer 6

You can't figure out a multiple guess question???
How sad!
Read the chapter again.

Answer 7

ice wedging