Ocean Floor Quiz

Describe ocean trenches. Include information about how the ocean floor looks in an area that has an ocean trench and what you know about the depth of the water.

• Ocean trenches are shallow and sandy.

• Ocean trenches are deep and narrow.

• Ocean trenches are wide and flat.

• Ocean trenches are high and rocky.

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Which organism eats both krill and jellyfish?

• Blue whale

• Sea turtle

• Shark

• Dolphin

Which of these is not part of a basic marine food web?

• Plankton

• Sea turtle

• Blue whale

• Eagle

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Which of the following is a swimming organism in the marine food web?

• Plankton

• Sea turtle

• Coral

• Seaweed

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What is the benefit of being a swimming organism in the ocean?

• To stay in one place

• To move to find food

• To avoid sunlight

• To grow larger

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Which organism is known to be stuck to surfaces in the ocean?

• Zooplankton

• Jellyfish

• Clams

• Phytoplankton

Why does the temperature decrease as depth increases in the ocean?

• Sunlight cannot penetrate deep into the ocean.

• The water is warmer at the bottom.

• The ocean floor generates heat.

• Fish make the water colder.

Which layer of the ocean is typically the warmest?

• Surface layer

• Thermocline

• Deep ocean

• Abyssal plain

How does the temperature change in the deep ocean below the thermocline?

• It increases slightly.

• It decreases slightly.

• It remains almost constant.

• It fluctuates significantly.

What is the effect of the thermocline on marine life?

• It creates a barrier for nutrient mixing.

• It increases oxygen levels.

• It decreases water pressure.

• It stabilizes salinity.

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