In 17-18 centuries, marked by the rapid development of archeology, scientists first put forward a suggestion that sometime b about the next part of the planet was under an icy cover. It came across them to this idea the study of the huge boulders scattered near the mountains - whole pieces of rocks, it is incomprehensible to what caused them there. It became obvious that these breeds could be brought by the only way - together with the glaciers slowly creeping.
Subsequently, detailed studies of this issue confirmed the assumptions of scientists. And by the end of the 19th century, due to the large contribution of the Russian scientist-geographer Kropotkin P.A. Modern ideas about the rarery periods in the history of the Earth were formed. Then the term glacier era, the ice age and the glacier era appeared. What do they differ from each other?
It was established that approximately 25% of its time history, the Earth was experiencing periodic climate cooling. Global time segments, when the average temperature on the surface of the planet falls, it is customary called Ice Eras. Each of them lasts hundreds of millions of years, and in the entire history of the Earth, 4 glacier era can be distinguished:
- Ranneproterozoic - 2, 5-2 billion years ago;
- Late Proterozoic - 900-630 million years ago;
- Paleozoic - 900-360 million years ago;
- Cenozoic - 65 million years ago- present time;
It turns out that we live during the next glacier era, inside which there was a small warming. In turn, glacial era are divided into Ice periods, each of which continues several tens of millions of years. At the moment, humanity lives during the next glacial period called the Quaternary Ice Age, which began approximately 1, 6 million years ago and continues to this day.
But the ice age itself is divided into many time segments, when the glaciers are retreating, then again begin their movement from the poles. Periods of cooling during the glacial period are called Ice Epochs, each of which lasts several tens of thousands of years. For example, the study of the composition of Antarctic ice made it possible to establish that over the past 800, 000 years, 8 glacier ears have changed on Earth, 70-90 thousand years. Each. It becomes clear that the segments of temporary warming range from 10 to 30 thousand years.
The last glacial era of the Quaternary Ice Age began about 110, 000 years ago and ended about 10, 000 years BC. It turns out, now we live during temporary warming, and the next glacier era will begin, probably in the next 20, 000 years.