In other areas of the Arctic, beluga whales have begun to congregate in groups. They only gathered at the mouths of a few large bays. Belugas of all ages and sizes have gathered here, including young belugas. so young that they are only about a week old and still need help. At this time, they swim on their mother's back to be able to breathe more easily. When the tide rises in the bay, beluga whales swim upstream and dive into unimaginable dives. Like walruses, they need to shed their skin, which can be achieved by the strong friction between warm, fresh water and gravel. The belugas will remain for several more days or weeks to carry out social activities between families. , they will return to the sea to find their prey.
As autumn approaches, the sea begins to freeze again. A thin ice forms on the surface of the water, gradually forming an impenetrable barrier.stable under the layers. At the end of November, the Arctic Sea freezes again, and the North Sea freezes again. Lights divide winter. The sky is dazzling.
On the other side of the earth, in Antarctica, there are also auroras australis. Antarctica has just woken up from winter. It is the windiest and coldest place on earth, and the temperature always hovers around . In the extremely cold minus 50 degrees, the reappearing sunlight cannot feel any temperature. Almost no animal can survive in such an extreme environment, but apart from that, emperor penguins stand on the sea ice and use their thick fur for protection. resist the Antarctic blizzard. Thanks to the powerful power of penguins, groups of penguins stay close to each other and take turns to resist the blizzard. Only emperor penguins cooperate with each other to survive here. that is to say that the AntArctic is surrounded by the Southern Ocean, no large land predators can reach there, so unlike arctic animals, they are not threatened by polar bears.
The sea surface is still frozen and a seal can stay through solid sea ice, even throughout the winter. Seals can avoid the threat of snowstorms underwater, but they must be exposed to them. air all year round, to breathe they use their teeth to ensure that the ventilation holes are clear. Only by constantly grinding the ice holes can their breathing channels be guaranteed. However, their teeth were also badly damaged. therefore, making them unable to hunt or eat effectively, Wedel Sea seals do not live long and the wear and tear of their teeth is a significant reason for this.
Antarctica is geographically isolated and has high relief. In some places,the altitude is almost 5 km. Therefore, it is relatively colder than the Arctic. The ice blocks slide slowly from the center to the edge. glaciers. Antarctica in winter, due to the freezing of sea water, the area has expanded significantly to twice the size of sea ice and surrounds the entire continent, extending hundreds of kilometers towards the exterior. -krill, which survives in the frozen ocean. They spend the whole winter here during the dark season, the amazing thing is that they shrink and stay young to conserve their energy. the temperature warms in spring, the sea ice begins to melt, the bubbles contained in the seashore are released and tiny algae grow in these bubbles and become the main food for the krill. They use their undulating arthropods to collect algae. the sunlight becomes stronger until it can penetrate the depthss of the sea, they float. Plants have begun to multiply and thrive, along with the krill. Will leave the reduced waterfront area and gather in groups to enjoy sumptuous new dishes.
Why doesn't sea water freeze easily? If we want sea water to freeze, what conditions must be met? Ice forms when water freezes at low temperatures. Water can freeze not only in our homes but also in lakes and rivers. However, we never seem to hear about the sea freezing. Why is this? Is it because the ocean is bigger and therefore less likely to freeze? To find out the cause of this problem, children can carry out an experiment themselves. Place a small bottle of drinking water and a small bottle of salt water in the refrigerator at the same time. After a while, open the refrigerator and you will find that the drinking water has frozen, but the salt water has not. For whatis it?
Actually, this is because the freezing point of salt water is lower than that of pure water. It will not freeze at 0°C, and the thicker the brine, the lower the freezing point. Some sea water does not freeze at -20°C. Some children may wonder: there are many icebergs on the sea at the North and South poles, why does the sea freeze there? Is it because the North and South poles are colder? No, icebergs floating in and around the poles are not made of frozen water. Greenland and Antarctica have large ice sheets. Large chunks of ice break off and drift in the ocean, forming icebergs.
This ice is actually made of fresh water. If you place frozen ice cubes in salt water, they turn into miniature icebergs. Of course, the sea is not completely ice-free, but it freezes under strict conditions. First, the temperature is lowerbelow the freezing point, which is below the temperature of the water, and the heat of the water is lost. Second, there is the condensation core of suspended particles, snowflakes and other impurities in the water. If these conditions are met, sea ice can form. Seawater is the most abundant substance on earth, and the ocean also occupies the largest surface area on the planet. However, no matter the day, protecting the ocean is always something we need to do. The ocean is where life begins, and many secrets are hidden in this limitless ocean. Children should study hard and explore the mysteries of the deep sea when they grow up.