Bipolar, a geographical term, refers to the North Pole and the South Pole.arcticandantarcticyesearthTwo endpoints on the, which are hypotheticalearth rotationThe two intersections of the axis and the earth's surface.In the northern hemisphere, it is called the North Polesouthern hemisphereIt is called South Pole.
Bipolar, a geographical term, refers to the north and south poles.North Pole: The intersection of the northern segment of the Earth's axis and the Earth's surface.South Pole: The intersection of the southern segment of the Earth's axis and the Earth's surface.
content
Announce
edit
becauseearthIt's aroundAutorotation shaftThe two poles are the only two fixed points on the surface of the earth.It is all on the earthMeridianA place where convergence occurs.From the North or South Pole to the EquatorMeridianThe distances are all equal.
Through long-term observation, people found that,earthThe two real poles on the top are not always stationary, but are moving slowly.suchGeopoleThe movement of is called "pole shift".The range of the pole shift is very small, although it is only as big as the basketball courtLongitude and latitude of the earthHowever, the accuracy of has no small impact.becauseGeopoleyesGeographical coordinatesIt is impossible to accurately measure the longitude and latitude of any place without knowing its exact position.In addition, scientists also found that the pole shift may be related to large earthquakes, because the pole shift will causeearthLarge scale internal material migration, thus inducing large earthquakes.
In polar regions, "polar day" and“Polar night”Phenomenon.Although the polar region has been in daylight for half a year, the light that can really reach the polar region to increase heat is very little, so the polar region is still frozen all the year round, with abnormal cold.In the Antarctic region, there is even a low temperature of - 94.5 ℃.In such cold natural conditions, no tree or grass can survive naturally.Even things like metal and rubber will be as brittle and fragile as glass.But what's strange is that a large number of penguins can“cold pole ”Live and work in peace and contentment.
Two polar regions
Announce
edit
The Antarctic region is the coldest region on the earth. It is very cold even in the warm season (November to March of the next year).The Antarctic region is known as the "ice and snow plateau". Most places are covered with very thick ice, with an average thickness of more than 2000 meters.Icebergs are a remarkable natural scene of the sea surface near the Antarctic continent. They are formed by the fall and collapse of the Antarctic continent glaciers into the sea.According to statistics, there are more than 10000 cubic kilometers of icebergs on the sea around the Antarctic continent, which is a huge reservoir that can be used by human beings.
In addition to the severe cold, the Antarctic region is also known asearthFor the "white desert" and "wind reservoir" in Shanghai, the annual average precipitation in most areas is 55 mm, and the place with the least precipitation is less than 5 mm;The annual average wind speed is 17~18/s, and the maximum wind speed can reach 100 m/s.
Although the Arctic is not as cold as the Antarctic, most areas are frozen all the year round.The average temperature in January is between - 20 and 40 degrees, and the average temperature in August is only - 8 degrees.The precipitation in the Arctic region is generally much higher than that in the Antarctic region, and the average annual precipitation is between 100 mm and 250 mm.The wind speed in the Arctic is far lower than that in the Antarctic, and the average wind speed along the Arctic Ocean is only 10 m/s.
