Question 24
Which of the following describes the mechanical weathering process called THERMAL EXPANSION?
alternate freezing and thawing of water in cracks and fractures in the rock
disintegration resulting from plants and animals
alternate expansion and contraction of rocks due to heating and cooling
rounded exfoliation of igneous and metamorphic rocks
Question 25
Wide valleys are characteristic of mature streams. They display ______________
broad floodplains and many meander bends
broad floodplains and vigorous downcutting
meanders and rapids
many rapids and waterfalls
Question 26
Which of the following factors does NOT affect a stream’s velocity?
gradient
channel size
magnetic field
the size of sediments on the stream bed
channel geometry ( in different parts of the channel the stream velocity are different)
question 27
Question 28
The imaginary line that separates two stream drainage basins is called _________.
a dashed line
a boundary line
a divide
a line of hills
Question 29
Most fresh water is found in __________________________.
frozen form as glaciers
swimming pools
lakes and rivers
underground as groundwater
Question 30
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