Quaternary glaciers, what are 4th glaciers

The Quaternary had glacial and interglacial periods.

I don't know what you want to ask about the Quaternary glaciers?

Quaternary glaciers were the most recent great glacial periods in Earth's history. Glaciers occur as huge bodies of ice moving along the ground in polar or alpine regions. Due to the large amount of snow that falls above the snow line, formed by gravity and great pressure, the glacier receives a large amount of ice from the source, and the ice melts very slowly, and the laughing glacier itself develops wide and deep, until the downstream high temperature, the ice supply becomes less, and the glacier becomes smaller and smaller, until the amount of ice melt and the amount of upstream replenishment cancel each other.

Generally, glaciers are tongue-shaped, and the glacier surface is often uneven, and there are deep cracks in some places, that is, ice crevasses. Glaciers can be divided into two main categories: continental glaciers and mountain glaciers. During the Quaternary period, there were at least five expansions of mountain glaciers in the European Alps.

In China, according to Li Siguang's research, there were four subglacial periods in Poyang, Dagu, Lushan and Dali.

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Analysis: In geological history, there has been a period of large-scale glacial activity with a cold climate, called an ice age. There have been three such glacial periods, namely the Late Precambrian, the Carboniferous Permian and the Quaternary.

When the Quaternary Ice Age came, the average annual temperature of the earth was 10 15 lower than now, more than 1 3 of the world's continents were covered by ice and snow, the glacier area reached 52 million square kilometers, the ice thickness was about 1,000 meters, and the sea level dropped by 130 meters. The Quaternary glacial period is divided into 4 glacial periods and 3 interglacial periods. During interglacial periods, the climate warms, sea levels rise, and the earth comes back to life.

The Quaternary glacial period has the most relics, such as the fjords of Scandinavia, the numerous moraine remnants in Northern Europe, Central Europe and North America, the U-shaped valleys and steep peaks of the Alps, and the huge ice drift gravel of the Jura Mountains on the border between France and Switzerland, all of which are the products of Quaternary glaciation.

The glacial age in the broad sense is also known as the Great Ice Age, and the glacial age in the narrow sense refers to the glacial period one level lower than the Great Ice Age. The Great Ice Age refers to a geological period in which the Earth's climate is cold, the polar ice sheets thicken and spread, and there are sometimes strong glaciation in the middle and low latitudes. The colder periods of the Great Ice Age are called glacial periods, and the warmer periods are called interglacial periods.

The Great Ice Age, the Ice Period, and the Interglacial Period are all geological time units based on climate. The duration of the Great Ice Age is equivalent to the epoch of the geological time unit or greater than the epoch, and the time interval between the two Great Ice Ages can be several epochs, and it has been suggested that the occurrence of the Great Ice Age has a cycle of 100 million years, based on statistical data. The duration of glacial and interglacial periods corresponds to the period of geological time units.

In the billions of years of geological history, there have been at least three major ice ages in the world, including the Late Precambrian Ice Age, the Carboniferous-Permian Ice Age, and the Quaternary Ice Age. The moraine left behind in the area where the glacier has been active is the main object of glacial research. The Quaternary glacial moraine layer is the most well-preserved, the most widely distributed, and the most thoroughly studied.

In the Quaternary, according to the change of glacial cover, it can be divided into several glacial and interglacial periods, and the ice sheet area accounts for about 30 and 10 of the land surface area respectively. However, the degree of glacier development varies greatly from continent to continent, with the European continent reaching 48°N while Asia only reaching 60°N. Due to regional differences in climate change and research methods, the division of ice ages varies from place to place.

1909, A. of GermanyPenck and EBrückner studied Quaternary glacial deposits in the Alps, dividing and naming 4 glacial and 3 interglacial periods.

Subsequently, the corresponding glacial and interglacial periods were also divided around the world.

There are various theories about the cause of the Great Ice Age, but many researchers believe that it may be related to the solar system's orbital cycle in the Milky Way. Some believe that the luminosity of the sun when it moves near the galactic center is minimal, which cools the planets and forms the Great Ice Age on Earth; Some believe that the uneven distribution of matter in the Milky Way, when the sun passes through the denser interstellar material, reduces the sun's radiation energy and forms the Great Ice Age on Earth.

Fourth Season Ice Age.

It was the most recent ice age in Earth's history.

Since the Neo-Tertiary appeared glacial and interglacial periods, it has continued to the present.

Ice sheets began to appear in the Antarctic as early as the Oligocene, and the ice sheets in the middle Miocene were already large-scale, making them the first regions to enter the ice age.

The glacial environment at the beginning of the Quaternary period affected the whole world and reached its peak in the middle period, so the Late Cenozoic glacial period mainly refers to the Quaternary glaciation.

At that time, there were two large ice sheets in the Northern Hemisphere, the Scandinavian Ice Sheet and the North American Lauren Ice Sheet.

The southern boundary of the former reaches 50° north latitude and the latter reaches around 38° north latitude.

In addition, foothill glaciers or Xiaoice caps have developed in some high mountains at mid- and low-latitude latitudes.

About 8,000 to 10,000 years ago, the world became generally warming, a large number of glaciers and ice sheets disappeared or contracted, and the earth entered the post-glacial period.

However, the glaciers and ice sheets of the continents have not completely disappeared.

The Earth is now in the interglacial period of the fourth glacial period, and the temperature is still rising.