weathering
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what is weathering
The break down of large rocks, into smaller pieces of sediment, which is left in the same area that the rock use to be in
name there three types of weathering
Mechanical weathering Chemical weathering Biological weathering
what is Mechanical weathering
Mechanical weathering is the physical breakdown of a material without altering its its chemical composition
what are the three types of Mechanical weathering
Freeze- thaw action Rocks peel (Exfoliation) Expansion and contraction
explain the Freeze- thaw action
water collects in the rock crack water freezes and expands , forcing crack to widen ice thaws , contracts and water goes deeper into the cracks again repeat expansion and contraction causes further cracks until the rock breaks
explain the Rocks peel (Exfoliation
rock surface heats up and expands rock surface cools and contracts joints form around the outer part of rock these rocks break eventually
explain the Expansion and contraction
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what is Chemical weathering
Chemical weathering is the breakdown of rock though chemical process, like acid rain
what kind of environment does Chemical weathering mostly occur
chemical weathering happens most in humid, tropical regions where there is a lot of moisture in the air.
how is acid rain formed anyhow does it affect plants
Rainwater absorbs carbon dioxide and Sulphur dioxide from the atmosphere and from plant roots and it forms a weak carbonic or sulphuric rain or when fossils fuels burn an give off gases , the gases combine with water in the atmosphere and it falls back to earth as acid rain or snow when this rain seeps through permeable rock ,it corrodes the rock
what type of rock does chemical weathering affect the most Why? what does corroded lime stone form
lime stone because lime stone is very permeable. (has large pores to allow water to sink in.) When lime stone dissolves underground it can form amazing caves like the Cango caves.
what is Biological weathering
biological weathering involves weathering caused by animals , plants and people
what causes Biological weathering
1 )when decomposing plant material makes rain water more acidic, this acid reacts with the chemicals in the rock and breaks it down. 2)PLANT ROOTS Trees and plant roots grow into cracks of rocks as they grow, they break up the rock. 3) BACTERIA AND LICHEN Moss and lichen on rocks also absorb moisture from rain, and keep the water on the surface of the rocks for longer. 4) ANIMALS Animals burrowing through the earth and weakening the soil and rock particles.
What is Stalagmites and stalagtites
Stalagmites are when calcium carbonate is deposited on the floors of caves stalactites are when calcium carbonate is deposited on the roofs of caves