AnswersCentral 25-26 CR SCI 100B SpringCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which type of wetland includes a mixture of salt water and fresh water?

A
bogs
B
swamps
C
inland marshes
D
coastal wetlands
2
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Which option identifies ways that people positively affect Earth’s resources?

A
use cars that emit fewer harmful gases, build dams, and stop using all resources
B
stop using all resources, increase mining efforts, and halt the runoff of factory waste into rivers and streams
C
build dams, use cars that emit fewer harmful gases, and halt the runoff of factory waste into rivers and streams
D
increase mining efforts, build dams, and use cars that emit fewer harmful gases
3

What is one way people have negatively affected land resources?

A
habitat restoration
B
urbanization
C
terrace farming
D
reforestation
4

Why is the Continental Divide important?

A
It forms two river systems.
B
It combines two large ice sheets.
C
It separates two major watersheds.
D
It splits two large rivers through tributaries.
5

How has the EPA improved air quality over the last 30 years?

A
by monitoring pollutants and passing regulations to reduce air pollution
B
by decreasing soil erosion and dust storms
C
by building marine refuges to help protect marine life and reduce air pollution
D
by decreasing of fossil fuel use in motor vehicles and industry
6

Why are plants unable to grow at the bottom of lakes?

A
The water is colder at the bottom.
B
Sunlight does not reach the bottom.
C
Groundwater feeds into the bottom.
D
Less fresh water is found at the bottom.
7

Which activity is a method of habitat restoration?

A
cleaning up after environmental disasters
B
allowing trees to grow naturally
C
farming techniques like terrace farming and tree belts
D
creating a reservoir to prevent flooding
8

How does a pond form?

A
A mudflow blocks a river.
B
Water collects in a low-lying area.
C
Humans use a dam to create a reservoir.
D
A depression made by an ice sheet fills with water.
9

Which term refers to the process by which land is worn away by natural forces or human activity?

A
erosion
B
desertification
C
urbanization
D
deforestation
10

Which phrase describes a feature of groundwater?

A
feeds rivers
B
provides habitats
C
makes up 75% of fresh water
D
used for hydroelectric power
11

Which statement best describes the streams on either side of the Great Divide?

A
They feed different water sheds.
B
They channel rain to the Pacific Ocean.
C
They flow into the same drainage basin.
D
They have some of the same large rivers.
12

Where do rivers usually begin?

A
at the ocean
B
at groundwater outlets
C
in mountainous regions
D
in lakes and larger rivers
13

How do wetlands form?

A
Tributaries flow into rivers.
B
Runoff travels down the side of a divide.
C
Water builds up in a depression left by an ice sheet.
D
Groundwater comes to the surface and floods the land.
14

Which statement explains one difference between marshes and bogs?

A
Marshes are highly acidic, while bogs are not.
B
Bogs look like flooded forests, while marshes contain grasses.
C
Marshes can contain fresh water, while bogs contain salt water.
D
Marshes are areas of shallow water, while bogs are deeper areas.
15

Which phrase describes runoff?

A
underground water that flows into lakes
B
river water that empties into an ocean
C
water from streams that flows into larger rivers
D
water from rain and snow that travels to streams
16

Which statement identifies a reason to preserve wetlands?

A
They supply water to river systems.
B
They store floodwaters.
C
They divide different watersheds.
D
They are used for hydroelectricity.
17

What human activity contributes to air pollution?

A
construction
B
reforestation
C
habitat restoration
D
dam development
18

How do rivers become larger as they travel across land?

A
Groundwater rises, adding water to rivers.
B
Tributaries combine, adding water to rivers.
C
Ice sheets melt slowly, adding water to rivers.
D
Rainfall in an area increases, adding water to rivers.
19

How do icebergs form?

A
They form when seawater freezes.
B
They form when groundwater freezes.
C
They break off from the coast of Iceland.
D
They break off large ice sheets found at the poles.
20

Which freshwater source is a permanent shallow body of water with plant life throughout?

A
lake
B
pond
C
reservoir
D
wetland

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