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15 Cards in this Set
- Front
- Back
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Name the largest of the four main oceans.
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Pacific Ocean
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How did people find out long ago what the ocean floor was like?
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Sailors used long ropes with weights,scientiest used echoes.
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How did scientists use echoes to map the ocean floor?
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Sound waves were sent from a ship. Scientists measured how long it took them to bounce back.
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What did Jacques Cousteau and Emile Gagnan develop?
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an underwater breathing device- a tank of air attached to a face mask.
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What are riverlike streams of water that move at different speeds in the ocean?
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currents
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How did sailors use currents?
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They knew that if they sailed their ships with the currents, they could go faster.
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How do oceanographers use satellite pictures taken high above the earth?
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The pictures show the different temperatureso of ocean water and the ocean's currents.
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Which currents carry cold water?
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Currents flowing from near the North or South Poles.
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Which currents carry warm water?
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Currents flowing from the equator.
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What causes the currents that flow near the ocean's surface?
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Wind direction and movement of the earth
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Why is Great Britain's winter warmer than Canada's?
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Because the warm ocean currents warm the air.
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What is a wave?
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The up and down movement of ocean water caused by wind.
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Why do waves break when they reach the shore?
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A wave picks up energy from wind as it moves. When it comes near shore, the bottom part slows, but the top breaks
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How do waves affect the earth's shoreline?
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They erode the rocks and sediments, they wear away surfaces, they move sand to other places.
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What are some of the ocean's habitats?
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the shoreline, light zone, dark zone, coral reef
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