Are the deepest seafloors of the five continents connected to the Earth s mantle?

The deepest part of the seabed is not connected to the mantle, it is still an extension of the continental shelf, and the mantle is still below the earth's crust, and the difference here is still dozens of kilometers! Drifting because the Earth is rotating! If you float on water, the weight of the object on the ground will not change, because the gravitational force will not change!

This question is not professional, the earth's crust is under the mantle, drift involves plate tectonics, there is a mid-ocean ridge under the ocean, and there are ** cracks on the surface of the mid-ocean ridge, and magma flows out or erupts from there, causing the seabed to expand, which causes the continent to crack and move relatively, and the expanded seabed subducts in the trench and then turns into magma, so there are many volcanoes near the sea.

You can imagine that the mantle is a glue-like thing, and the earth is like an egg, and the oceanic crust (Chinese should be the seabed) and the continental crust (the continent) floats on the mantle, like eggshells and egg whites.

In terms of density, the continent is smaller than the ocean, smaller than the mantle, smaller than the outer core, and smaller than the inner core.

Is this satisfying?

Underneath the Earth's crust is the asthenosphere, and it is thought that the continental plates float in the asthenosphere.

The landlord, Lai Pi!! The question supplement has little to do with the original question!!

Ahhh The question adds: I don't know.

The Mediterranean Sea is the world's largest intercontinental sea, located between southern Europe, North Africa, and southwest Asia. It is about 4,000 kilometres long from east to west, with an average width of 1 5 per cent of its length from north to south, and only a kilometre at its narrowest point at its western end. It has an average depth of 1,500 meters.

With a total area of 10,000 square kilometers, about 1 4 of the area of Europe, it is the sixth largest sea in the world. Bounded by a peninsula and islands in the sea, it can also be divided into seven "sub" seas: the Ligurian Sea, the Tyrrhenian Sea, the Adriatic Sea, the Ionian Sea, and the Aegean Sea.

Originally, there were two ways out of the Mediterranean: one was in the northeast, through the Dardanelles, the Sea of Marmara, and the Bosphorus, leading to the Black Sea; One is at the western end, along the Strait of Gibraltar to the Atlantic Ocean. There are many ports on the north coast, including Gibraltar (British), Marseille (France), Naples, Venice (Italy), Slulit, Rijeka (Croatia), Athens (Greece), Durres (Albania) and Port Said on the south coast.

Since ancient times, it has been an important passage for coastal countries to communicate with each other or to the outside world, and the ancient civilizations of Egypt, Greece and Rome were transmitted to all parts of the world. Since the opening of the Suez Canal in the southeastern Mediterranean, the Mediterranean Sea has become a transportation artery connecting the Atlantic Ocean and the Indian Ocean. Ships come and go, and traffic is very busy.

The northern shore of the Mediterranean Sea is dominated by the tall Alps, and on the southern shore is the vast Sahara Desert, with only two major rivers, the Nile and the Po, fed fresh water on the north and south banks. In the Mediterranean, the summer is very hot and dry, and the sea evaporates a lot. It has been calculated that the evaporation of seawater alone in a year can reduce the thickness of the entire sea by meters.

In this way, the waters of the Mediterranean Sea will dry up day by day. But this is not the case. What is the reason for this?

It turned out that the Dardanelles, Bosphorus and Gibraltar were both navigation channels and drainage and irrigation channels. The salinity of the Black Sea and the Atlantic Ocean can flow into the Mediterranean Sea through the surface of the strait, while the saltier and heavier waters in the Mediterranean Sea are discharged into the Black Sea and the Atlantic Ocean from the deep layers of the strait, and they come and go smoothly without mixing with each other. In this way, the waters of the Mediterranean Sea will not decrease day by day, nor will they become more and more salty.

Although the salinity of the sea water in the Mediterranean Sea is not low, the content of phosphate and nitrate is relatively low, which is not good for fishery production, and only tuna, sardines and other fish are produced locally. And production is declining due to industrial pollution.