Oceans1
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- 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?
- currents
- 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