Weathering Rates Question Preview (ID: 69)

Properties Effecting Chemical And Physical Weathering Including Temperature, Surface Area And Moisture Content. TEACHERS: click here for quick copy question ID numbers.

Why will a rock weather more rapidly if it is broken into smaller particles?
a) There is more surface area exposed.
b) The total mass of the rock and the particles is reduced.
c) The smaller particles are less dense.
d) The mineral structure of the rock has been changed.

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 flat and thin
b) a piece shaped like a cylinder
c) a piece shaped like a cube
d) a piece shaped like a sphere

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) greater
b) less
c) the same
d) none of the above

Which factor has the least effect on the weathering of a rock?
a) the number of fossils found in the rock
b) exposure of the rock to the atmosphere
c) composition of the rock
d) climatic conditions

A rock will weather faster after it has been crushed because its
a) surface area has been increased
b) volume has been increased
c) density has been decreased
d) molecular structure has been altered

In hot, wet climates, bedrock rapidly weathers into soil because water
a) dissolves many minerals
b) expands when it freezes
c) is part of most chemical compounds
d) cools the surroundings when it evaporates

What occurs when a rock is crushed into a pile of fragments?
a) The total surface area increases and chemical composition remains the same.
b) The total surface area increases and chemical composition changes.
c) The total surface area decreases and chemical composition remains the same.
d) The total surface area decreases and chemical composition changes.

Which climatic conditions normally produce the greatest amount of chemical weathering?
a) warm and moist
b) warm and dry
c) cool and moist
d) cool and dry

Which long-term atmospheric changes would increase the rate of chemical weathering of surface bedrock?
a) increasing temperature and increasing precipitation
b) increasing temperature and decreasing precipitation
c) decreasing temperature and increasing precipitation
d) decreasing temperature and decreasing precipitation

The most likely reason powdered limestone reacts faster than a single large piece is that it has
a) more total surface area
b) lower density
c) more chemical bonds
d) less total volume

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