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Science Question 21


Danielle Bash

on 23 April 2010

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Transcript of Science Question 21

Chapter14 Section 1and 2 Analyze factors that affect the rate of weathering? Mechanical Weathering Chemical Weathering Differential Weathering It's strictly a pysical process
and does not change the
composition of the rock. Agents of mechanical
weathering are ice, plants
and animals, gravity, running
water, and wind. Physical changes in the
rock can also affect
mechanical weathering. For example, overlying
rocks are eroded, granite
that formed deep beneath
earth's surface can be exposed,
dcreasing the pressure on the
It's process is which a rock is
broken down because of
chemical interactions with
the enviroment. Chemical weathering occurs
when chemical reactions act
on the minerals in the rock. It commonly occurs between
rock, water, carbon dioxide,
oxygen, and acids. Chemical weathering changes
both the chemical composition
and physical appearance of the
rock. It's the process by which softer,
less weather- resistant rock wears
away and leaves harder, more resistant
rock behind. Rocks that are rich in mineral quartz
are exposed on earth's surface, they
remain basically unchanged, even after
all of the surrounding rocks have weathered away. It remains unchanged because the
chemical conposition and crystal
structure of quartz make quartz
resistant to chemical weathering.
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