80% of the earth's biological resources are in the ocean. Without destroying the ecological balance, the ocean can provide 3 billion tons of aquatic products every year and can feed 30 billion people. Among marine aquatic products, people eat the most fish. There are more than 20,000 kinds of fish in the world, and there are about 2,000 species in China's waters. Most of the world's fisheries are located on the continental shelf.
Between 270 and 135 million years ago, the main place of biological evolution shifted from water to land. The fern forests on land were gradually replaced by gy···...
Between 430 and 345 million years ago, intense orogeny occurred in the earth's crust. The sea surface shrank, land appeared widely, and the climate became dry a···...
About 3.2 billion years ago, single-celled organisms such as bacteria and simple algae appeared in the primitive ocean. For example, cyanobacteria, which are st···...
The origin of life has always been a subject of research by scientists. Judging from current research results, it is generally believed that life originated in ···...
In the southeastern sea of the Yangtze River Estuary, there is the largest island group in my country, which is the Zhoushan Islands. Geographic location ma···...
In the vast expanse of blue waves in the south of the motherland, Hainan Island, the second largest island in our country, lies. It is separated from the Leizho···...
If there are no clouds in the sky and the sky is high and the air is crisp, you stand on the high point of the central coast of Fujian and look eastward. In the···...
In the vast expanse of blue waves in the south of the motherland, Hainan Island, the second largest island in our country, lies. It is separated from the Leizho···...
Islands are a general term for land masses of varying sizes that are above the water surface in the ocean. In meaning, a yurt is a smaller ocean land mass than ···...
An old navigator once said: "The islands in the ocean are like the stars in the sky, no one can count them." This sentence describes the large number of islands···...
The Gulf of Alaska is located in the northeastern corner of the North Pacific and the northwest side of the North American continent. It covers an area of 1.327···...
A bay belonging to the Indian Ocean. It is embedded in Sri Lanka (Ceylon) to the west, India to the north, Myanmar and the Andaman-Nicobar Ridge to the east, an···...
On the southeastern edge of North America, there is an oblate gulf, named the Gulf of Mexico because it borders Mexico. The east and north of the Gulf are the U···...
In the northwest of the South China Sea in my country, there is a large, semi-enclosed bay called Beibu Gulf. It is bounded by my country's Leizhou Peninsula an···...
The Dardanelles Strait is located on the west side of the northwest corner of Turkey. It is an important channel connecting the Sea of Marmara and the Aegean Se···...
The Strait of Gibraltar is located between southernmost Spain and northwest Africa. It is an important gateway connecting the Mediterranean Sea and the Atlantic···...
Between the Malay Peninsula and Sumatra Island, there is a long and slender waterway that runs from southeast to northwest. Its northwest end is connected to th···...
Between the island of Great Britain and the European continent, there is a waterway connecting the Atlantic Ocean and the North Sea, which is the famous English···...
Between Taiwan Province and Fujian Province in my country, there is a broad waterway running from northeast to southwest. It is the largest strait in my country···...
On the west bank of Bohai Bay, the shell embankment along the coast of Huanghua City, Hebei Province is famous far and wide. In recent decades, Huanghua Shell B···...
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