What is a glacier? When was the Ice Age

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The Ice Age is a period when the Earth's ice cover expands dramatically.

Ice ages are divided into the Great Ice Age and the Xiaoice Ice Age.

During the Great Ice Age, the ice cover area was more than 45° north latitude, and the average surface temperature during the Great Ice Age was about 0.

The ice cover during the Xiaoice period expanded to between the Arctic Circle and 45° north latitude, and the average surface temperature during the Xiaoice period was about 5.

The ice cover area of the interglacial period is within the Arctic Circle (66°34 north latitude), and the average surface temperature during the interglacial period is about 15.

Inner Mongolia Autonomous Region Xilin Gol League East Wuzhumuqin Banner is located at 116 degrees east longitude and 45 degrees north latitude).

An ice age, also known as an ice age, is a period in which the Earth's land and oceans are covered by ice during certain ages. These ice-covered areas are much larger than the areas that are currently covered by ice. During the Ice Age, ice covered large swathes of the world's land, and the climate in these regions was very cold; There is a lot of ice in the ocean, and the ground is also covered with thick ice.

At the same time, sea levels are lower because more water is stored in ice. Ice ages can last more than a million years, and there have been 11 ice ages since the formation of the earth, the last ice age is called the "Great Ice Age", which occurred 18,000 years ago and ended 10,000 years ago, when about one-third of the Earth's land was covered under 240 meters of ice. During the Ice Age, the temperature dropped, changing the plant phase and the habitat of organisms on the earth's surface, and many organisms faced extinction or forced migration, and only species that could adapt to the environment survived.

Entering the ice age means that the earth's temperature drops, the land and sea are covered by ice, and the climate is cold, which will change the living environment of plants and organisms on the earth's surface, and many organisms will face extinction or forced migration, and only species that can adapt to the environment can survive.

The main factors that formed the Ice Age were as follows:

1. The decrease of sunshine in the summer half year is the main reason, and the change of sunshine in the summer half year is related to the change of the eccentricity of the earth's orbit, the angle of intersection between the ecliptic plane and the equatorial plane, and the precession.

2. The luminosity of the sun when it moves to the near galactic center is the smallest, which makes the line or star cool and forms the Great Ice Age on Earth.

3. The matter in the Milky Way galaxy is unevenly distributed, and when the sun passes through the dense interstellar material, the radiation energy of the sun is reduced and the Great Ice Age on the earth is formed.

4. It is directly related to the drop of the earth's surface temperature, which is affected by factors such as atmospheric composition and solar radiation energy changes, and is also restricted by various factors such as the earth's hall and the sun's orbit.