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8.E.1.2 Hydroshpere 4
Test Description: Summarize evidence that Earth's oceans are a reservoir of nutrients, minerals, dissolved gases, and life forms:
Instructions: Answer all questions to get your test result.
1) Which natural feature protects inland bodies of water from contamination by salt water?
A
bog
B
canyon
C
hydrothermal vent
D
estuary
2) Most of the oxygen in Earth’s atmosphere is produced in the top six inches of the oceans. Which best explains this?
A
Oxygen is produced by deepwater plants and is then moved to the surface of the ocean.
B
Oxygen is produced by photosynthetic microorganisms that live near the surface of the ocean.
C
Oxygen is produced as a by-product as fish breathe through their gills.
D
Oxygen is produced by seawater, which evaporates into pure oxygen and hydrogen.
3) Why are large numbers of ocean animals found in areas where upwelling occurs?
A
Oxygen is increased by the movement of water.
B
Nutrients are decreased by the movement of water.
C
Nutrients are increased by the movement of water.
D
Oxygen is decreased by the movement of water.
4) Which technology has allowed scientists to accurately map the ocean floor?
A
scuba
B
submersibles
C
satellites
D
sonar
5) Which dissolved gases are most needed by plants and animals living in the ocean?
A
nitrogen and oxygen
B
carbon dioxide and nitrogen
C
oxygen and carbon dioxide
D
carbon monoxide and nitrogen
6) Which property must submersibles and ROVs (remotely operated vehicles) share?
A
They must be able to withstand extreme water pressures.
B
They should be able to emerge quickly.
C
They must be able to transport several scuba divers.
D
They should be able to employ robotic arms.
7) Which best explains why inhabitants of an estuary must adapt to frequent environmental changes?
A
The salinity of the water is constantly changing.
B
Low levels of oxygen are absorbed by the water.
C
The water temperature is constantly warm.
D
Estuaries receive little sunlight.
8) Why are estuaries often valued as the center of human coastal communities?
A
Estuaries are needed to filter pollution out of ocean water.
B
Estuaries provide a place for people to live, fish, and swim.
C
Estuaries create mild habitats for deep sea life.
D
Estuaries enhance marine biology resources for the future.
9) Which are the two main sources of the dissolved oxygen in the ocean?
A
animal respiration and dead matter decomposition
B
warm water vents and Earth’s core
C
underwater volcanoes and earthquakes
D
surface air and ocean plants
10) Which best describes an estuary?
A
nutrient-poor swamps and bogs of the Great Lakes
B
nutrient-rich salt marshes and mangrove forests of the Florida Everglades
C
nutrient-poor Cape Fear River and Deep River basins
D
nutrient-rich tributaries and meanders of the Blue Ridge Mountains
*select an answer for all questions
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