Geology Cafe

Introduction to Geology

Quiz 8 - Weathering & Erosion

1. Which of these is a component of soil?
a. disintegrated and decomposed rock
b. decayed organic matter
c. air
d. water
e. all of the above


2. Which of these best describe weathering?
a. the transfer of rock material by gravity
b. the mechanical and chemical disintegration of rock on the surface of the earth
c. the alteration of feldspar into clay minerals
d. the removal of material by water or air
e. the chemical breakdown of a rock


3. What is the most important agent of chemical weathering on Earth?
a. oxygen
b. salt
c. carbon dioxide
d. carbonic acid
e. water


4. Loose and incoherent surficial deposits usually found on or along the base of a slope and brought their chiefly by gravity:
a. colluvium
b. alluvium
c. laterite
d. chalky soil
e. loam

5. Mechanical weathering includes:
a. biological activity.
b. unloading.
c. frost wedging.
d. thermal expansion.
e. all of the above.


landslide quiz image
6. What forces and processes are responsible for the features illustrated on the diagram?
a. weathering and erosion
b. mass wasting
c. landsliding
d. gravity
e. all of the above

7. Which of these common minerals is most weathering resistant on the Earth's surface?
a. quartz
b. olivine
c. biotite mica
d. potassium feldspar
e. calcite

8. What is the layer of rock and mineral fragments produced by weathering located between the bedrock and the surface in most places?
a. humus
b. soil
c. alluvium
d. regolith
e. zone of leaching


9. When granite is weathered, what happens to most quartz?
a. it is broken down to form clay minerals
b. it is broken down to oxide minerals
c. it changes to biotite
d. it remain virtually unchanged, becoming gravel, sand, and silt
e. it dissolves and becomes part of seawater.

10. When a granite is weathered, what happens to most feldspar?
a. it is broken down to form clay minerals
b. it is broken down to oxide minerals
c. it changes to biotite
d. it remain virtually unchanged, becoming gravel, sand, and silt
e. it dissolves and becomes part of seawater.

Extra Credit: There are locations on Earth where green olivine sand exists. Where would you expect to find such a deposit?
a. along a stream in a mountainous region composed of sedimentary rocks.
b. in a talus on the slopes of a cinder cone composed of rhyolite.
c. on a beach of river delta located far downstream from a distant mountain range.
d. on a beach near a volcano composed of lava with ultramafic composition.
e. all of the above.
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8/28/2012