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Vor 20 Stunden · Between 34 million to 44 million years ago, an epoch known as the middle-to-late Eocene, Earth's atmosphere transformed drastically. As carbon dioxide levels plummeted, global cooling triggered ...
Vor 2 Tagen · Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. [4] [5] [6] Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.
Vor einem Tag · A megaannus (Ma) represents one million (10 6) years. The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth.
Vor 20 Stunden · Mohammed El-Said. Hugo Olierook. Scientists found what may be the oldest evidence of fresh water on land dating back to 4 billion years ago, which indicates that the hydrological cycle on Earth where water is transferred continuously between land, oceans and atmosphere started 500 million years earlier than previously thought. “The ...
Vor 2 Tagen · The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran period 538.8 Ma (million years ago) to the beginning of the Ordovician Period 485.4 Ma. Most of the continents lay in the southern hemisphere surrounded by the vast Panthalassa Ocean.
Vor 4 Tagen · In contrast, much of the oceanic crust is substantially younger (tens of millions of years old), and none dates back more than 200 million years. This conceptual framework in which scientists now understand the evolution of Earth’s lithosphere —termed plate tectonics —is almost universally accepted, although many details remain ...
Vor 2 Tagen · 250-million-year-old fossil unveiled by modern scanning techniques. Thousands of years ago, right before the dinosaurs roamed the earth, there lived a pig-like, tusked creature known as Gordonia traquairi, an ancient cousin of today’s mammals. For the first time, experts can now dig deep into the anatomy and evolution of this species through ...
