rocks

2. Weathering is
the breaking
down of rocks
and other
materials on the
Earth’s surface

3. Two types of weathering are
:Mechanical and Chemical
weathering

4. No change in the rock’s chemical composition.
 Agents of mechanical weathering include:
 Temperature: causes repeated expansion and contraction

5. Ice wedging (frost action, freeze-
thaw cycle): when liquid water
goes into
cracks and then freezes causing
the
cracks to get wider

6.  Organic activity (root-pry, burrowing animals, human activities

7.  Gravity: rocks falling and colliding with other rocks

10. Classic sheeted granite
along the Tioga Road,
Yosemite National Park.
The granite is broken into gently dipping plates
by unloading joints. Unloading joints probably form as the rock
is exposed by erosion. These joints,
and others that are more steeply oriented, provide pathways for
water to enter the rock

11.  Process by which rocks are decomposed,
dissolved or loosened by chemical
processes to form sediment