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
A _______1.________ is an area of land adjacent to a stream or river prone to flooding.
_______2.__________typically flood when the nearby river or stream surpasses its flood stage.
_____2.___________ are usually flat areas with higher elevation on both sides.
1. oxbow lake, 2. oxbow lakes
1. wet house, 2. wet houses
1. levee, 2. mouthbar
1. floodplain, 2. floodplains
Alluvial fans form ____________________.
where a high-gradient stream (stream with a steep slope) leaves a narrow valley
where a stream gradient changes from steep to flat
where there are hills or mountains
all of the other answers
Which of the followings is NOT a tributary contributing to the Mississippi River System (or the Mississippi drainage basin)? Canadian River
In meandering streams, point bars form _____________________.
on the cutbank side of the meander, where stream velocity is highest
on the inside edge of the meander, where stream velocity is highest
on the cutbank side of the meander, where stream velocity is lowest
on the inside edge of the meander, where stream velocity is lowest
Meanders are a feature of _____1.______. As rivers age they develop ______2.______ meanders. Eventually, meanders become so exaggerated that the curve is abandoned and _____3._______ is formed.
1. old age; 2. more and more exaggerated; 3. an oxbow lake
1. beauty; 2. water falls; 3. a dry river
1. rivers youthful nature; 2. less; 3. a dry lake
1. geology; 2. dangerous; 3. a beach
If we compare a youthful stream with a graded river, we notice which of the following differences?
[choose two correct answers]
Youthful streams commonly have waterfalls but graded rivers do not.
Graded rivers commonly have waterfalls but youthful streams do not.
Graded rivers have steep gradients, whereas the youthful rivers have smooth concave profile decreasing in angle and gradient
towards the mouth
Youthful streams that are actively down-cutting their channels tend to be relatively straight and are typically ungraded, compared to a graded river which has a graded profile
A “drainage basin” is _______________________.
a pot to catch rain the runs off the roof
the area drained only by a major river
the area drained by a stream and its tributaries
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