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Chapter 13

True or False

True or False
Based on the information in the chapter, determine whether each of these statements is true or false.

This activity contains 13 questions.

	The term "regolith" refers to the upper layers of the surface that are exposed to weathering.    True  False

	Sediments are the unconsolidated, fragmented products of weathering processes from which soils develop.    True  False

	Joints and fractures in rock are important to weathering because they increase the surface area on which air, water, dissolved acids, and salts can operate.    True  False

	Hydrolysis is a weathering process in which silicate minerals break down due to interaction with water, though they do not combine chemically.    True  False

	Generally speaking, root wedging is less influential than frost action among mechanical weathering processes.    True  False

	Precipitation, temperature, atmospheric pressure, and freeze-thaw cycles are all important direct controls on weathering rates.    True  False

	Pressure-release jointing occurs when tree roots penetrate joints in rocks, releasing internal pressures and causing rocks to split apart.    True  False

	Sheeting is an exfoliation process common in places characterized by horizontal (or nearly horizontal) layers of sedimentary rocks.    True  False

	Frost action is particularly important in high mountain environments, where it produces rock fragments that accumulate as talus slopes at the base of cliffs.    True  False

	Solution and hydration are merely two different names for the same process, which is important in the formation of karst landscapes.    True  False

	Collapsed sinkholes are circular depressions that form in karst landscapes when solution sinkholes collapse into subterranean caverns.    True  False

	Mass movements occur on slopes under the influence of gravitational stress.    True  False

	Earthflows are unique among mass movements in that they can occur on perfectly level ground.    True  False

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