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Someone has made statistics and found that there are more than 500,000 species of living things on the earth. Living things can be divided into three categories: animals, plants and microorganisms. According to some statistics, there are more than 180,000 kinds of animals and 20,000 kinds of
The evolution of living things is not like modern humans climbing stairs, from the top of one staircase to another. It is a transition from the ancestral form of this group to another group. Birds evolved from an early branch of reptiles. The earliest bird fossil is the world-famous Archaeopt
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 gymnosperms represented by cycads, ginkgo, and metasequoia. The vast land is full of dense virgin forests. But at that time, there was
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 and hot. Cretaceous marine biomes During the ebb and flow of sea water, some algae slowly adapt to life
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 still widely living today, still retain their original prokaryotic state. Ancient marine animal and plant communit
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 the ocean. Water is an important component of life activities, and the protection of seawater can effectively prevent ultraviolet ray
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 Leizhou Peninsula at the southern tip of the mainland by only one water, and between them is the Qiongzhou Strait, which is about 20 kilome
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 Leizhou Peninsula at the southern tip of the mainland by only one water, and between them is the Qiongzhou Strait, which is about 20 kilome
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 in the world. So far, how many islands are there in the oceans around the world? It's hard to tell an exact number. Some people say
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 million square kilometers, a volume of 3.226 million cubic kilometers, a maximum depth of 5,659 meters, and an average depth of 2,43
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, and the line connecting Cape Dondela at the southern end of Sri Lanka and Cape Urellue at the northwest end of Sumatra to the south. bo
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 United States, the west and south shores are Mexico, and the southeastern sea is Cuba. The Gulf of Mexico enters the Atlantic Ocean th
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 the Andaman Sea, and its southeast end is connected to the South China Sea. This is the Strait of Malacca. The total length of the stra
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 Channel and the Strait of Dover. These two straits are actually one, but historically they have been divided into two straits, bound
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. Because it is close to Taiwan, the largest island in my country, people call it the Taiwan Strait. The Taiwan Strait runs through t
With the development of science, technology, economy and society, people's ability to control, transform and utilize nature has also been continuously strengthened. Artificial coasts, that is, coasts constructed entirely artificially that change the original natural state, are becoming larger
In the distant Antarctic and North Pole, what comes into view is the vast ice caps and snowfields, where is the world of ice and snow. The coasts of Antarctica and the Arctic Ocean are very unique. It is difficult to see sand, sand, and rocks there. Instead, the coast is made up of crystal cl
Coasts made of hard rock are called bedrock coasts. It has clear outlines, strong lines and majestic momentum. It not only has masculine beauty, but also has an ever-changing charm. It is one of the main types of coast. Sea stack bedrock coasts often have protruding headlands, and between the