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Weathering Rates
Test Description: Properties effecting chemical and physical weathering including temperature, surface area and moisture content.
Instructions: Answer all questions to get your test result.
1) Why will a rock weather more rapidly if it is broken into smaller particles?
A
The smaller particles are less dense.
B
The mineral structure of the rock has been changed.
C
The total mass of the rock and the particles is reduced.
D
There is more surface area exposed.
2) Four pieces of the same rock material which have different shapes but equal volumes are exposed to the atmosphere. Which piece would probably weather fastest?
A
a piece shaped like a cylinder
B
a piece shaped like a cube
C
a piece shaped flat and thin
D
a piece shaped like a sphere
3) A large rock is broken into several smaller pieces. Compared to the rate of weathering of the large rock, the rate of weathering of the smaller pieces is
A
none of the above
B
greater
C
the same
D
less
4) Which factor has the least effect on the weathering of a rock?
A
climatic conditions
B
composition of the rock
C
the number of fossils found in the rock
D
exposure of the rock to the atmosphere
5) A rock will weather faster after it has been crushed because its
A
density has been decreased
B
molecular structure has been altered
C
surface area has been increased
D
volume has been increased
6) In hot, wet climates, bedrock rapidly weathers into soil because water
A
cools the surroundings when it evaporates
B
dissolves many minerals
C
expands when it freezes
D
is part of most chemical compounds
7) What occurs when a rock is crushed into a pile of fragments?
A
The total surface area decreases and chemical composition remains the same.
B
The total surface area increases and chemical composition remains the same.
C
The total surface area decreases and chemical composition changes.
D
The total surface area increases and chemical composition changes.
8) Which climatic conditions normally produce the greatest amount of chemical weathering?
A
warm and dry
B
cool and moist
C
warm and moist
D
cool and dry
9) Which long-term atmospheric changes would increase the rate of chemical weathering of surface bedrock?
A
decreasing temperature and increasing precipitation
B
increasing temperature and increasing precipitation
C
decreasing temperature and decreasing precipitation
D
increasing temperature and decreasing precipitation
10) The most likely reason powdered limestone reacts faster than a single large piece is that it has
A
more chemical bonds
B
more total surface area
C
lower density
D
less total volume
*select an answer for all questions
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