The effects of weathering
The process of mountain building thrusts rock up to the earths surface. There rock becoms exposed to weathering. Weathering is the process that breaks rock and other substances at earths surface. few very fine and fine oblique roots er,and ice all contributes to weathering.So dose the oxygen and carbondioxside in the atmosphere. repeated freezing and thawing, for example, can break apart into smaller pieces. Rain water can dissolve minerals that bind rocks to together. You don't need to go to the mountains to see examples of weathering. The force that wear down mountains also cause bicycles to rust, paint peal, side walks to crack, and post holes to form.
Mechanical weathering
If you hit a rock hard enough with a hammer , the rock will break in to pieces The type of weathering in which rock is physically broken in to smaller pieces is called Mechanical weathering. These smaller pieces of rock have has a composition as the rock they came from. If you have seen rocks that are cracking or peeling in layers , the reson you have seen rocks that under going mechanical weathering . Mechanical weathering breaks rock sintopieces by freezing and thawing, release of pressure, growth of plants, actions of animal sand abrasion.
In cool climates the most important part of weathering is freezing and thawing of water. Water seep sint o cracks of rock sand freezes, when the temperture drops. Water expan ds when frozen there forice act slikeawdge.Ice eventualy cracks the rock in half after a w hile of freezing and thawing and see pingdeeper.
Soil
Soil make sup thet hinla yers of the earth where we live. These oil supports the ecosystem. Because the soilislo catedat the interface, where theat mosphere and land meet, sothesoilacts like a policeman and directs the rightamoun to frain to whe reitneed stogo. T h e soilal so purifies the water. Many waste products and chemical pesticides are destroyed by soilmicr oorganisms. Soil that wander sabout these dimentin waters or as dustcontributesto the pollutiontoour environment.
Testing Plant Tissue
Very often the soil may contain an in adequate supply of plant foods butt he plantit self may not beable to properlyassimi lateit. This may bedue to several reasons, including plant disease, dry soilorrootinjury.
soil horisons