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
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
Which of the following factors does NOT affect a stream’s velocity?
the size of sediments on the stream bed
channel geometry ( in different parts of the channel the stream velocity are different)
The imaginary line that separates two stream drainage basins is called _________.
a dashed line
a boundary line
a line of hills
Most fresh water is found in __________________________.
frozen form as glaciers
lakes and rivers
underground as groundwater
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