What is the main content of Underwater World ? What is the main content of the lesson The Underwat

Main content: In the depths of the seabed, there are no wind and waves, no sunlight, and darkness. There are only glowing fish with tiny sounds from various animals.

And the animals here travel at different speeds. The topography and plants of the seabed are also diverse, and there are many mineral deposits, making the scenery strange.

When I came home from school, I put down my school bag, and I asked my grandmother for a transparent glass bottle, an egg, a pair of chopsticks, and a bag of salt. Fill the glass bottle with water, then put the egg into the glass bottle filled with water, and the egg sinks to the bottom of the bottle. Then half a bag of salt was poured in, and after the salt of the white flower flower entered the water, it began to spread out under the glass bottle water, like a thick layer of white snow.

But the egg stood still. I said, "Why are the eggs still calm?"

Then my grandmother asked me to stir gently with chopsticks, and the salt dissolved into water. Eventually, the egg floated slowly! So when I came home from school and put down my school bag, I asked my grandmother for a transparent large-mouth glass bottle, prepared an egg, a pair of school bags, and I asked my grandmother to ask for a transparent large-mouth glass bottle, prepared an egg, a pair of chopsticks, and a bag of salt.

Fill the glass bottle with water, then fill the egg with the saltwater and say that the brine can float a raw egg. I'm curious! So I wanted to do this experiment.

I came home from school, put down my school bag, and asked my grandmother for a clear glass bottle.

From the aspects of the light on the seabed, the sounds of the seabed, the movement and migration of the animals on the seabed, the landforms and plants of the seabed, and the mineral deposits on the seabed, the text introduces the underwater world of "strange scenery and abundant products" in Shibianqing.

The Underwater World is selected from a text in the seventh unit of the second volume of the third grade of primary school Chinese of the People's Education Edition, the author introduces the strange scenery and rich resources of the underwater world through vivid and vivid language, and expresses the author's praise for the underwater world.

Text: "The underwater world" is derived from the sounds of the seabed, the characteristics of the activities of the animals on the seabed, and the plants on the seabed.

The difference between DAO and the topography of the seabed introduces the marine bottom world.

The seafloor is the deep underside of the ocean, where the sea water meets the land. The ocean covers an area of about 362,000,000 square kilometers (140,000,000 square miles), nearly 71% of the Earth's surface area. The oceans contain more than 1.35 billion cubic kilometres of water, accounting for about 97 per cent of the Earth's total water.

The world's oceans are generally divided into oceans and smaller seas.

The four main oceans of the ocean are the Pacific, Atlantic and Indian Oceans, and the Arctic Ocean (some scientists have added the fifth ocean, the sea near Antarctica), most of which are bounded by land and seabed topography.

The text "The Underwater World" introduces the underwater world from two aspects: strange scenery and abundant products. Return.

Underwater World is.

Answer: In Unit 10 of Volume 5 of Primary School Chinese of Beijing Normal University, the author uses vivid language to let students perceive the strange scenery and abundant products of the seabed, and stimulate students' interest in exploring the mysteries of nature.

Animals, animal movements, plants, mineral deposits.

The scenery is beautiful and the products are abundant.

The scenery is strange and the products are abundant.

Before, all the time, woo

This paper introduces the underwater world from four aspects: the sound of the seabed, the characteristics of the activities of the animals on the seabed, the differences in the plants on the seabed, and the topography of the seabed.

The seabed refers to the deep water below the ocean, where the sea meets the land. The ocean covers an area of about 362,000,000 square kilometers (140,000,000 square miles), nearly 71% of the Earth's surface area. The oceans contain more than 1.35 billion cubic kilometres of water, accounting for about 97 per cent of the Earth's total water.

The world's oceans are generally divided into oceans and smaller seas.

The morphology of the solid earth's surface beneath the water cover. Due to the concealment of the seawater, the undulations of the seabed are difficult to observe directly.