North Carolina Science Grade 6

Chapter 3: Erosional Forces

Erosional Forces

1.
Where do rockfalls and rock slides commonly occur?
A)near a streambed
B)in the desert
C)areas with steep cliffs
D)on the prairie
2.
What is till?
A)large pieces of glacier sediment
B)grooves left in the land from a glacier
C)small pieces of glacier sediment
D)a mixture of different-sized glacier sediment
3.
Slumps, creeps, rockfalls, rock slides, and mudflows are examples of __________.
A)mass movement
B)soil formation
C)erosion from wind
D)deposition
4.
Most dunes __________.
A)are made of gravel
B)move across the land
C)stay perfectly still
D)are pushed out of the land by volcanic forces
5.
What is the main difference between a creep and a slump?
A)the type of material that is moved
B)the distance over which the material is moved
C)the speed at which the movement occurs
D)the direction along a slope that the movement occurs
6.
Which type of land suffers the least from wind erosion?
A)desert
B)beach
C)forest
D)plowed fields
7.
Which type of windstorm requires the weakest wind?
A)sandstorm
B)dust storm
C)gravel storm
D)tornado
8.
In an outwash deposit, which types of sediment drops first?
A)largest
B)smallest
C)medium-sized
D)All are dropped at the same time.
9.
How is wind different from other erosional forces?
A)Wind only moves sediment over small areas.
B)Wind is not strong.
C)Wind does not shape the land.
D)Wind doesn't move heavy objects.
10.
What type of glacier is Antarctica covered with?
A)valley
B)flat
C)smooth
D)continental
11.
What causes dunes to form?
A)wind
B)mountain building
C)glacial deposits
D)deposits from streams
12.
Which sediment has the smallest grain?
A)gravel
B)sand
C)dust
D)loess
13.
What effect does vegetation have on erosion?
A)It has no effect whatsoever.
B)It resists erosion.
C)It speeds erosion up.
D)It increases the possibility of mass movement.
14.
When did the last ice age end?
A)4.6 billion years ago
B)about 1,800
C)about 180,000 years ago
D)about 18,000 years ago
15.
Which force causes erosion to occur?
A)nuclear
B)electrical
C)magnetic
D)gravity
16.
What type of valleys are made by valley glaciers?
A)flat
B)V-shaped
C)U-shaped
D)streambed
17.
What is plucking?
A)when wind erosion moves large objects
B)when rocks, gravel, and sand are moved by a glacier
C)when a glacier pulls a tree from its roots
D)when water in a stream causes rocks to move downhill
18.
How do roots stop erosion?
A)They loosen soil.
B)They lift up sediment.
C)They block wind from the soil.
D)They hold sediment into place.
19.
How does wind abrasion work?
A)Sediment falls off of a surface on its own.
B)Sediment is blown off a surface from wind.
C)Wind-blown sediment strikes a surface.
D)Wind blows large chunks of rock off a surface.
20.
Which of these states has a lot of glacial erosion?
A)Florida
B)Ohio
C)Hawaii
D)California
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