What is the crawl?

In the scientific community, Planet Earth is commonly understood that it is subject to periodic climate changes with fluctuating temperatures. Records of these changes can be found in the geological layers of the Earth and in the chemical signatures of fossilized residues. Age is the result of reduced temperatures around the planet; Specifically the movement and activity of glaciers. It is an expansion of ice sheets created by accumulation of snowfall, which has no time or the opportunity to melt. The existence of glaciers deeply affects the long -term climatic trends of the planet; Glaciers are also responsible for soil formation such as carving valleys and other types of erosion. The gravity force transmits them to the hillsides and are lubricated with molten water at the lowest level of the glacier; the pressure of the more ice. The glaciers are also expanding when they reduce snow and freeze on ice. During the day, they raise parts of the glacier that are melting on the threshold and move the surrounding Earth. In this way, the crawl causes relocation of sediment and materials; Are frozen to the glacier and store elsewhere when withE LED melts.

Glaciation is one of the causes of a large land change. The primary example is erosion; Glaciers cause erosion in three ways: plucking, abrasion and freezing. Glacial jerking occurs when the glacier moves down the slope and moves the ice to pull the already scattered rock. Arusion is caused by a rock attached to the glacier as it moves; The friction between the movable rock and the background causes the subsoil erosion, so most of the valleys are formed. Freeze-frost, meanwhile, it occurs when the molten water penetrates into cracks in the rock, where declining temperatures cause freezing and expanding and expanding cracks.

The address period occurs in Milankovitch cycles or variations in the Earth's orbit around the Sun for 100,000 years. For example, the obliqueness or angle of axial tilt is between 21.5 and 24.5 degrees, which changes the amount of heat that the polar ice caps receive. A smaller angle means lessThe heat hits the poles and allows you to create glaciers and is also true. The eccentricity caused by the gravitational pull of Jupiter and Saturn causes the Earth's orbit to become more elliptical, and therefore further from the Sun, leading to colder temperatures. Precession or rotation of the Earth's axis changes the orientation of the Earth relative to the sun and other planets.