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Erosion
Potpourri
Chemical
Weathering
Mechanical
Weathering
Deposition
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True or false…
Erosion occurs
when rocks are
not moving…
False
What can be
moved because
of erosion?
Rocks,
sediment, and
Earth materials
The formation of sand dunes
is the result of —
A
B
C
D
abrasion
chemical weathering
erosion by moving water
deposition
Deposition
The rich topsoil of the prairie in the picture shown makes this
ecosystem suitable for the growth of a variety of grasses. All of
the following processes contribute to the formation of the topsoil
in the prairie except —
A weathering of rocks
B ocean waves
C deposition of weathered material
D decomposition of living things
ocean
waves
_______is the most
important erosional
agent and
erodes most often in
streams or rivers.
Water is the most
important erosional
agent and
erodes most often in
streams or rivers.
A hurricane forms over the ocean and hits the Texas coast and travels inland. What is the most likely
effect of this event?
A
B
C
D
More species of animal will inhabit the coast
The shape and size of beaches will be changed
The affected area will be less vulnerable to future natural disasters
Native plants will never inhabit the area again
B The shape and size of
beaches will be changed
When the scooter hits a rock, the rider tends to fly forward because –
A objects at rest tend to stay at rest
B the scooter is subjected to a balanced force
C a force opposes the motion of the scooter but not the rider
D unbalanced forces cause objects to move at a constant speed
C. a force opposes
the motion of
the scooter but not
the rider
Which of the following is a force
that can oppose or change motion?
A.
gravity
B.
air resistance
C.
friction
D.
all of the above
D. all of the above
Force
Load
The diagram above illustrates a movable pulley. This pulley gives a
mechanical advantage by A reducing the force required to lift the load.
B changing the force direction
C requiring the force to be greater than the load
D requiring the force to move less distance than the load
A. reducing the force required
to lift the load.
The picture shows a simple fixed pulley being used to lift a heavy box.
Which of these does the pulley change?
A
A. The mass of the box being moved
B
B. The amount of force required to move the box
C
C. The direction of force required to move the box
D
D. The amount of energy required to move the box
C. The direction of force required to move the box
Chemical weathering happens quickly in
______, _______environments because
water is needed for the chemical reactions.
warm, moist
In chemical weathering, a rock is broken
down by ______ ______that change its
mineral composition and physical
and chemical properties
chemical reactions
True of False:
Water can chemically weather rocks by
dissolving rocks.
True
True of False:
Living organisms
such as Lichens do
not chemically
weather rocks.
False
True of False:
Rust is a form of
chemical weathering
True
Mechanical
weathering:
__________ breaks
rocks down into
smaller pieces
physically
True or False:
Weathering
happens to
rocks that are
moving.
False
Explain how this is an
example of weathering?
The tree roots are growing
into the rock prying it into
smaller pieces
How does freezing and thawing
cause mechanical weathering?
When water freezes, it expands
causing the cracks go grow
What is abrasion?
Mechanical weathering in which
rocks rub against together
wearing them down
What is it called when a
glacier picks up a rock, or
sediments off of the ground?
Plucking
How can wind be a cause of erosion?
Wind can blow sediment
(dirt) from one place to
another
What happens to rocks and
sediment that are plucked by
glaciers whenever the glacier
melts?
The rocks and sediment are deposited
in a new location.
Describe how waves in the
ocean can cause erosion.
Waves can cause beaches
and coastlines to be
reformed time after time
What force causes rock slides and
mud flows?
Gravity!