Write a composition of 100 words on the topic of the mystery of the ocean. Thank you.

The ocean is the biggest unknown part of our world. It covers 7 1% of the earth. At this point, there is still much to be discovered.

A large area of water.

Some scientists are studying ways to transport a large amount of water from the ocean to desert in the world.

Others hope to control the weather by knowing more about the heat and moisture exchange between the ocean and the air. Others are studying the way sound propagates and the influence of water and heat on sound. What happens when seawater comes into contact with different elements is another research topic. Oceanographers are working hard to solve several of these problems.

One of the most interesting projects in oceanography is to map the seabed. Only a small part is drawn. When only surface ships sail on the world's oceans, this is not important, but for people in submarines, it may mean the difference between life and death.

A long time ago, there was only one way to know how deep the ocean was.

A sailor can throw a heavy rope beside the boat. When the rope reached the bottom, he pulled it up.

But this is not a very accurate measurement method.

In the twentieth century, people found a better way. Sound is used to measure the ocean. An American warship sailed into a narrow water area for an experiment. The sailors dropped some devices, which made a loud noise when they hit the bottom. A small instrument was invented to measure the time it takes for sound to reach the ship. This helps oceanographers to map the seabed.

Underwater photos are also very important in drawing submarine maps. With the improvement of the new method, the camera can take pictures of underwater canyons, even in color.

If the water in the ocean can be removed, the seabed and its wide valleys, uneven mountains and underwater rivers will be an incredible sight. Around the edge of the continent, the sea floor is flat, and the sea will not get deeper for about 30 miles. Where there are young mountains along the coast, this flat part may be much less than 30 miles. But where rivers flow into the sea, flat areas may extend for hundreds of miles.

The area near the mainland, where the water is not very deep, is where the richest marine life in the ocean is found. Beneath these creatures and plants are the largest known minerals.

At the end of the flat part, the seabed suddenly sinks, forming a bowl-shaped pit. These huge holes contain most of the water in the world.

Imagine, if possible, that a mountain range extends 40,000 miles around the earth. It is hard to believe that only a few years ago, the huge underwater mountains around the earth were discovered. The mystery of the ocean.

The ocean is the biggest unknown area in our world. It covers 7 1% of the earth's surface. In this vast water layer, there are many places worth exploring.

Some scientists are studying how to replenish a lot of seawater to the deserts in the world.

Others hope to control the weather by understanding the alternation of heat flow and water vapor between the ocean and the air. Others are studying how the propagation of sound is affected by water and heat. What happens when the ocean touches different elements is another project that needs to be studied. Oceanographers only devote themselves to studying a few problems. I mean the project mentioned above, probably. )

The most interesting project in oceanography is to map the ocean layer (which looks like the bottom of the sea). )。 Only a small part of the ocean is drawn. When only ships are sailing on the sea surface of the world, this is not important, but for submarines and related personnel, it will be related to their lives.

A long time ago, there was only one way to know the depth of the ocean.

An ocean man (again, it's ... an ocean man anyway! [clenched fist]) It should be someone who is familiar with the sea. You can throw a rope tied with a heavy object into the sea from the boat and pull it up when it reaches the bottom of the sea.

But this measurement method is not accurate.

In the twentieth century, a better method was discovered. Measure the sea with sound. An American navy ship sailed into a narrow sea area for an experiment. Sea people (tragedy, tragedy. Put a certain number of machines in, and once they touch the bottom of the sea, those machines will make a lot of noise. Then use the invented small instrument to measure the time when the sound touches the ship. This gives oceanographers the help they need when drawing a map of the seabed.

Underwater photography is also an important part of drawing submarine maps. Using a new method that has been perfected, the camera can take pictures on the seabed, even in color.

If the water in the sea can be pumped away, the seabed with wide canyons, mountains and underwater rivers will become an incredible sight. In all continents (such as America, Asia, Europe, Australia, rice, etc.). The edge of the seabed will be flat and the water depth will not exceed 30 miles. But at the entrance of the river, the flat area may extend for nearly a hundred miles.

In the area near each continent, the water is not deep, and you can find very rich (varieties. ) Living underwater. Beneath these creatures and plants is the largest amount of metals known at present.

At the end of the flat area, the seabed will suddenly drop, forming a deep depression like the bow. These huge depressions (pits! ) owns most of the water in the world.

Imagine, if possible, a continuous mountain that surrounds the earth and stretches for 4 thousand miles. Not mountains, just a bunch of mountains. )。 It is hard to believe that this huge continuous underwater mountain range around the earth was just discovered a few years ago.