Sunday, 27 February 2011

sedimentry rocks (introduction)

Sedimentary rocks are rocks compossed of fragments that have been deposited compacted and cemented

Sedimentary rocks can be:

chemically weathered-   Through carbon dioxide reacts with rainwater and pore water in soil to form carbonic acid

physically weathered-  also known as mechanically weathering, exfoliation sometimes reffered as 'onion skin weathering'. in hot desserts there is marked difference beetween hot day time and cold night time temperatures. different minerals expand and contract by different amounts during heating and cooling, causing the rock to disintegrate.

biologically weathered-  caused by plant roots braking rocks and from burrowing from animals such as rabbits and worms.  

if there is any questions i would more than happy to answer 

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