Ifyoulookdownatourplanetfromouterspacemostofwhatyouseeiswater.Infactoceansandseascovermorethan70percentoftheplanet'ssurface.Millionsofyearsagotherewerenooceansontheearth.Thesurfaceof

Question

　　If you look down at our planet from outer space most of what you see is water. In fact oceans and seas cover more than 70 per cent of the planet's surface. Millions of years ago there were no oceans on the earth. The surface of the earth was very hot so water boiled away. As the earth cooled down steam in the air began to fall down as rain. It rained and rained for many thousands of years and made the first seas on the earth.

　　Oceans are a large and wonderful world full of strange and interesting animals and plants. More than 275 000 kinds of fish and other animals live in the ocean. Most of them live in the surface waters because there is enough food there. But there are also some unique animals in the deepest part of the ocean. Some animals live their whole life in the ocean (such as whales) and others can spend time in the ocean or on land (such as sea lions). They are very important to our life.

　　Believe it or not half of the oxygen （氧气） we breathe is produced by algae （藻类） the oldest plants on the earth! Each year we eat about 29 million tons of fish much more than cattle sheep and eggs. Without the oceans we cannot live!

　　The oceans are also rich in minerals （矿物） oil and natural gas and many other resources. Every natural element can be found in the ocean. About 3 . 5 per cent of ocean water is made up of salt which we eat every day. Nearly one-third of the world's oil comes from our oceans. In fact there is a lot of gold in ocean water too. If all the gold in the world's seawater were mined （提炼） each person on the earth could have about four kilograms of gold!

True or false:

(1) Water covers over 70 ％ of the earth's surface.

(　　)

(2) Oceans are a large wonderful world full of strange interesting animals.

(　　)

(3) All the animals in the oceans live in the surface waters.

(　　)

(4) The oceans gave us the air we breathe and the food we eat.

(　　)

(5) The oceans are full of gold to keep everyone happy.

(　　)

Answer 1

答案：T;F;F;T;T