The Ultimate Ocean and Marine Life Quiz

By: HowStuffWorks.com Contributors

The Ultimate Ocean and Marine Life Quiz
Image: iStockphoto.com/sweetlifephotos

About This Quiz

Oceans cover most of the Earth's surface. They include a vast diversity of life, everything from plants to large mammals. Oceans represent a truly undiscovered world for most people. Take this quiz and learn more about ocean life.
The oceans cover ______ of the Earth's surface.
60 percent
70 percent
The “seven seas” take up 70 percent of the Earth's surface and include 97 percent of the world's water.
90 percent

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Which ocean is the largest?
Pacific ocean
The Pacific ocean, which includes the North and South Pacific subdivisions, is the largest ocean. The Pacific ocean is 181 million square kilometers.
Atlantic ocean
Indian ocean

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Which ocean basin is the most geologically active?
Pacific ocean
The Pacific ocean contains many volcanic vents, seamounts and deep trenches. The Pacific basin is a rocky floor.
Atlantic ocean
Indian ocean

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How does water move around the world?
wind
gravity
both of the above
Shallow water is driven by wind, whereas deep water is driven by gravity.

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Ocean water moves:
from north to south
from south to north
in a circular pattern
Ocean water moves in large circular patterns called gyres. The Gulf Stream, which moves from Florida to the North Atlantic Ocean, is an example of a gyre.

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What are thermohaline currents?
cold water currents from the arctic
warm water currents from Africa
currents that move up and down in the ocean
Thermohaline currents move from the surface of the water down to the ocean floor and back.

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What type of water is more dense?
polar, cold water
Polar water is more dense because molecules travel closer together and because of salt crystals in the water.
equator, hot water
water close to the shore

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What are basalts?
volcanic rocks on the ocean floor
When plates on the ocean floor move apart, magma oozes out. This magma cools and hardens forming rocks, known as basalts, on the ocean floor.
volcanic eruptions under the water
volcanic ash found in the ocean

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What are the abyssal plains?
flat areas of the ocean floor
A large part of the ocean floor is flat and made up of sediment. These areas are known as the abyssal plains.
mountainous areas of the ocean floor
rocky and gagged areas of the ocean floor

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What property of water does salt alter?
freezing point
Salt in water alters its freezing point. Deep ocean water can still remain liquid at -2 degree Celsius.
boiling point
both of the above

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What are the main categories of sea life?
swimmers and non-swimmers
swimmers, floaters and creatures on the sea floor
Sea life consists of plankton (floaters), nekton (swimmers) and benthos (creatures on the sea floor).
fish, mammals and microscopic creatures

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What are phytoplankton?
a larger version of plankton
organisms that eat plankton
microscopic algae
Phytoplankton are microscopic algae that engage in photosynthesis.

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What are zooplankton?
small worms and jellyfish
clams
both of the above
Zooplankton eat phytoplankton. Small worms, small jellyfish, clams and larvae are examples of zooplankton.

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What are examples of benthos?
lobsters
Lobsters, oysters, sea anemones, barnacles, snails and halibut are all examples of benthos. These creatures all live along the ocean floor.
small fish
shrimp

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What type of creatures live near hydrothermal vents in the deep sea?
worms
The deep sea is the equivalent of a barren desert. Not much lives in the deep sea. Close to hydrothermal vents, however, you can find clams and worms.
fish
both of the above

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What sea life is at the very bottom of the food chain?
phytoplankton
Phytoplankton, which produces carbohydrates, is at the very bottom of the food chain. Phytoplankton is consumed by plankton.
microscopic fish
both of the above

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What do sea sponges eat?
phytoplankton
plankton
waste products from other fish
Sponges just sit and wait at the bottom of the sea. They feed on dead-organisms and small food particles from fish higher above.

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What sea creature may have cancer-fighting properties?
sponge
sea-squirt
both of the above
Researchers are investigating the cancer fighting properties of the ocean sponge and the sea-squirt.

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Seaweed compounds are added to:
beer
ice cream
both of the above
The Japanese eat more than 20 different varieties of seaweed. American use seaweed in abundance as well. Seaweed compounds are added to beer, ice cream and salad dressing.

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Where does offshore oil drilling occur?
the Persian Gulf
the North Sea
both of the above
The ocean's bounty also includes non-living products. Extensive offshore drilling occurs in the Persian Gulf, the North Sea and the Gulf of Mexico.

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You Got:
/20
iStockphoto.com/sweetlifephotos

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