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15 Cards in this Set

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