Transcript Weathering Notes

Weathering
I can….
• Identify the layers of the earth
• Describe how landforms can be changed by
weathering and erosion
• Explain how water can change landforms
such as creating caves and deposition of
sediments
Weathering
• Weathering- (Destructive Force) the term that
describes all the processes that break down
rocks in the environment near the earth's
surface.
• Erosion- The movement of weathered rock
• Mechanical Weathering- processes tear apart
rocks by breaking them into smaller pieces,
by physically destroying them.
• Frost Wedging - Water seeps into cracks of
rock, freezes, expands, and breaks the rock.
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• Tree roots-Tree root tips are tiny and
penetrate easily into fine fractures of rocks.
As the roots grow in diameter, they put stress
on the rock that can cause the fractures to
expand
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• Abrasion is simply the mechanism of rocks
breaking or wearing down by the direct
actions of other rocks.
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• Chemical weathering breaks down rocks one
atom at a time, dissolving minerals or
changing one mineral into a more stable one
• Usually occurs by water
• Dissolution- tears mineral grains apart and
carries away the ions
• Think of salt dissolving in water
• The reason for caves
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• Oxidation- When oxygen chemically reacts
with a mineral
• Example:Rust
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