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What causes an ocean current? An ocean current is a mass of water that keeps moving in one direction. Surface currents are caused by wind and the Earth’s rotation. Underwater currents are the result of differences in temperature and salt content of the water. 3. What is a black smoker? When water seeps into the crust of the ocean floor through cracks, it may be heated by the magma below. As pressure builds up within the crust, the hot water shoots up through these cracks. These jets of warm water are often black due to their mineral content, so they are called black smokers.

Q What are the various things that happen Geysers are jets of hot water that erupt from the Earth. When water trickles down into the hot molten rock under the Earth’s crust, it is heated up. As the water becomes hotter, the pressure builds up, finally causing it to spurt out. 36 during a volcanic eruption? A Magma, or molten rock, erupts through the surface of Earth during an eruption. Magma that comes out is called lava. It can be thick and slow moving or thin and fast. Pieces of rocks and ash also erupt from the volcano.

Wolves were believed to howl at the full moon. However, this is because they are more likely to hunt on a bright night and they howl to bring the pack together. qxd 21/5/07 12:14 pm Page 52 The Living Planet Elephants Elephants are the world’s largest land animals. They are divided into three different species – savannah, forest and Asian elephants. Savannah and forest elephants are together known as African elephants. Tragic tusks Elephants have often been hunted for their precious ivory tusks.

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Afload in a Boat

by Paul

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