Physical weathering-weathering of rocks, Biology

Physical Weathering

Mechanical forces acting upon the rocks cause physical weathering. Temperature fluctuations cause expansion and contraction of rock surface resulting in the formation of cracks apd fissures. During cold weather, the water present in rock crevices gets frozen and the formation of ice results in its expansion. The force of expansion causes breaking up of rock. Broken rock fragments roll down the slopes and break further into smaller pieces. Hails, rakfall and fast flowing streams are important agents of physical weathering. You might have seen rounded stone pieces of varying sizes on the bed of river where fast flowing river reaches the plains from its place of origin. Wind is another agent of physical weathering particularly when it carries sand particles which causes abrasion of rock surface, due to friction. In the hill forests, it is commonly seen that tree roots often penetrate through the rock crevices and in course of time, with the radial growth of roots, the rocks get disintegrated.

Posted Date: 12/11/2012 1:22:05 AM | Location : United States







Related Discussions:- Physical weathering-weathering of rocks, Assignment Help, Ask Question on Physical weathering-weathering of rocks, Get Answer, Expert's Help, Physical weathering-weathering of rocks Discussions

Write discussion on Physical weathering-weathering of rocks
Your posts are moderated
Related Questions
Regulation of Glycogen Metabolism It  is  important  for  you  to  understand  that  glycogenesis and gluconeogenesis are regulated  reciprocally. There  is  a  hormonal  regul

Permeability Permeability is the ability of a soil to transmit water or air. Permeability or infiltration rate is measured in terms of the rate of water flow through the soil i

What is lamarckism? The Lamarckism is the theory that unites the law of use and disuse with the law of the transmission of acquired characteristics that is that asserted that a

2. Mr Konarski, 73 years old, lives in a high-level care facility. He has dementia of the Alzheimer''s type, osteoarthritis in both knees and ankles, and hypertension, which is con

Define Anaerobic Exercise or Energy System? Thus, exercises which are done for short bursts of time lasting only for few seconds (less than 120 sec) use only anaerobic system o

Q. How can the visual deficiencies known as myopia and hypermetropia be optically explained? Myopia is the visual condition in which the images are formed previous to (in front

Define Regents for Estimation of Reducing Sugar by Fehling Soxhlet Method? Fehling A solution - copper sulphate solution Fehling B solution - alkaline tartarate so

Class Gastropoda Body asymmetrical, depicts torsion or its effects; shell coiled in most, well developed head with radula, large flat foot, gills one or two or with pulmonary

CHARACTERSTICS OF CLEAVAGE - In cleavage involve the series of mitotic division, so daughter cells are genetically similar to the parental cell. The resulting cells are c

classification on protozoans