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

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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 

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

Question 31 

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

Question 32 

 Which of the followings is NOT a tributary contributing to the Mississippi River System (or the Mississippi drainage basin)?  Canadian River 

Alabama River

 Ohio River

 Tennesse River

 Platte River

Question 33 

 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

Question 34 

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

Question 35 

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

Question 36 

A "drainage basin" is _______________________. 

 a pot to catch rain the runs off the roof

 the area drained only by a major river 

always round

the area drained by a stream and its tributaries