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Hydrology Review
Test Description: 8th grade Hydrology Unit Review
Instructions: Answer all questions to get your test result.
1) Which will most likely result if there is increased upwelling in a coastal area?
A
higher water temperatures
B
few nitrates
C
less nutrients in the water
D
more aquatic life
2) Which best determines the health of a lake used as a source of freshwater?
A
its temperature and pH
B
its location and depth
C
its depth and width
D
its temperature and depth
3) Why is water from an aquifer more likely to be cleaner than water from other sources?
A
because it receives water directly from precipitation
B
because it forms where fresh and salt water meet
C
because pollutants are filtered by rock and soil deep within Earth
D
because it rises to the surface near the ocean
4) In which oceanic zone do clams and crabs survive by burrowing in the sand?
A
deep ocean
B
open ocean
C
oceanic
D
intertidal
5) If a body of water has high turbidity levels, what can most likely be concluded?
A
It is unsafe to drink
B
It contains a lot of chemicals
C
It has a low pH
D
It is too hot to drink
6) Which best describes the characteristics of a river basin?
A
the land at the mouth of a river where water flows into the ocean
B
land formed when rivers create estuaries and marshes
C
the land drained by a river and its tributaries
D
the land formed as a result of a river flooding
7) Which factors can have the greatest effect on the health of a river system?
A
type of soil and salinity
B
nitrate levels and turbidity
C
human consumption and pH
D
natural disasters and tidal changes
8) In the United States, which is responsible for ensuring the safety of the country’s drinking water?
A
Center for Disease Control (CDC)
B
National Oceanic and Atmospheric Administration (NOAA)
C
Food and Drug Administration (FDA)
D
Environmental Protection Agency (EPA)
9) What is the most likely reason that upwelling creates productive fisheries?
A
It helps nutrients sink tot he bottom of the ocean
B
It lowers the pH
C
It removes nitrates from the water
D
It brings cold, nutrient-rich water to the surface
10) An ecologist found that the DO in a lake was highest in February and lowest in July. What is the most likely reason that this occurred?
A
The lake had a lower pH in July
B
There were higher temperatures in July and lower temperatures in February
C
There were higher nitrate levels in July
D
The lake had more photosynthesis occurring in February than in July
11) Why does reducing runoff from impervious surfaces improve water quality?
A
because the water infiltrates into aquifers and is filtered by rock and soil
B
because it allows water to pick up more pollutants from roads
C
because it causes more water to run along storm drains, cleaning them out
D
because it prevents water from seeping into aquifers
12) In which oceanic area does food energy come from chemosynthesis?
A
Hydrothermal Vents
B
Intertidal Zone
C
Neritic Zone
D
Photic Zone
13) If a body of water has very high pH, what can most likely be concluded?
A
It has high DO
B
It contains a lot of sediment
C
It is too hot to drink
D
It is unsafe to drink
14) Which best describes why we should protect estuaries?
A
They provide an area from recreation
B
They are breeding grounds for many aquatic species
C
All of these answers
D
They filter pollutants and erosion
15) What is the most likely reason that nitrate levels affect the health of rivers?
A
High nitrate levels can lead to high turbidity
B
High nitrate levels increase dissolved oxygen
C
High nitrate levels cause eutrophication
D
High nitrate levels make water taste better
16) In the United States, which agency enforces the Clean Water Act and Safe Drinking Water Act?
A
Environmental Protection Agency (EPA)
B
Food and Drug Administration (FDA)
C
Center for Disease Control (CDC)
D
National Oceanic and Atmospheric Administration (NOAA)
17) High nitrates lead to algae blooms. These algae die and rot, which reduces dissolved oxygen. What is this process called?
A
Turbidity
B
Upwelling
C
Biomagnification
D
Eutrophication
18) ___________ is a point source of pollution. ______________ is a nonpoint source of pollution
A
farm waste runoff, acid rain
B
oil spills, sewer pipes leading directly to a river
C
oil spills, farm runoff
D
farm waste runoff, oil spills
*select an answer for all questions
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