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Which kind of rocks form when heat and pressure change a rock?

Metamorphic rocks

How can changes in temperature make rocks break?

Temperature changes can also contribute to mechanical weathering in a process called thermal stress. Changes in temperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again, the structure of the rock weakens. Over time, it crumbles.

Does rock expand when heated?

As temperature increases expansion occurs, and as temperature decreases contraction (shrinkage) occurs. Rock is a very poor conductor of heat, so when a rock is exposed to varying temperatures the surface of the rock will expand, or contract, more than the center of the rock.

How does heat affect erosion?

Temperature – Changes in temperature caused by the Sun heating up a rock can cause the rock to expand and crack. This can cause pieces to break off over time and lead to erosion.

Can rocks freeze?

Yes, rocks are solids, though not all of them will have frozen and there’s a minor complication about what we mean by freezing for some rocks. Firstly note that sedimentary rocks formed by chemical processes so they were never liquid. So although these rocks are solid, they haven’t frozen.

Is frozen water a rock?

Glacier ice, like limestone (for example), is a type of rock. The mineral ice is the crystalline form of water (H2O). It forms through the metamorphism of tens of thousands of individual snowflakes into crystals of glacier ice.

Why do rocks contract when they freeze?

When the water in the cracks freezes, it expands by 9 to 10 percent, exerting pressure on the rock, according to BBC Bitesize. As this process of freezing and thawing happens repeatedly, the rock begins to weaken and eventually breaks apart into angular fragments.

What happens when rocks freeze and thaw?

Scientists have observed a process called freeze-thaw. That process occurs when the water inside of rocks freezes and expands. That expansion cracks the rocks from the inside and eventually breaks them apart. The freeze-thaw cycle happens over and over again and the break finally happens.

How does freeze/thaw weathering break up rock?

Freeze-thaw occurs when water continually seeps into cracks, freezes and expands, eventually breaking the rock apart. Exfoliation occurs as cracks develop parallel to the land surface a consequence of the reduction in pressure during uplift and erosion.