Ocean Circulation — Unit test Answers

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How do oxbow lakes form?

A
Rivers are dammed, and the water builds up, creating a lake.
B
Runoff pools in areas of low elevation, creating a temporary lake.
C
Rivers wear away banks until the bank is broken and the river flows straight.
D
Glaciers leave deep channels in the ground, which fill with water and become a lake.
3

Which describes bedrock?

A
consists of solid rock
B
lies directly above the soil layer
C
does not contain weathered rock
D
forms from decomposed material
5

Which term describes erosion?

A
creates small particles
B
hardens rock fragments
C
transports solid materials
D
dissolves rock components
7

In which direction does wave energy travel in the ocean?

A
up and down
B
north and south
C
with the currents
D
toward the shore
8

Which describes one feature of deep ocean currents?

A
have lower-salinity water
B
carry warm water from the equator
C
have higher-temperature water
D
move more slowly than surface currents
9

Which event occurs after Earth’s surface experiences weathering?

A
Wind carries sediments to a new location.
B
Ice forms cracks in large rocks.
C
Moving water breaks sediments into pieces.
D
Surface materials wear down into sediment.
10

Which rocks will likely weather the least?

A
rocks that are soft
B
rocks with a porous surface
C
rocks that are in a dry climate
D
rocks with minerals that dissolve easily
11

Which correctly lists the three types of rock particles that make up soil?

A
air, clay, and sand
B
clay, water, and silt
C
sand, clay, and silt
D
silt, water, and air
13

Which is one benefit that mangrove trees provide to surrounding coastal wetlands?

A
They hold soil in place.
B
They store floodwaters.
C
They maintain surface water flow.
D
They filter water and improve water quality.
14

Which statement explains one way that lakes form?

A
Lava flows block a river.
B
Streams flow into shallow areas.
C
Groundwater feeds into low-lying areas.
D
Grassy wetlands get covered by a stream.
15

Which process involves wind moving loose sediment?

A
abrasion
B
deflation
C
impact
D
plucking

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