The Precambrian era covers the creation of Earth up until the emergence of multi-celled life forms. The Precambrian accounts for roughly seven-eighths of Earth's history or approximately 4 billion years. The conclusion of this period came 570 million years ago, when the Earth's crust formed and complex life first took form in the seas.Know More
The Precambrian is not a true geologic era, but instead a period of time, containing three distinct eons: the Hadean, which was 4.5 to 4 million years ago, the Archean, which was 4 billion to 2.5 billion years ago, and the Proterozoic, which was 2.5 billion to 541 million years ago.
These periods contain the evidence to elucidate the formation of Earth's landmasses, oceans and ultimately the creation of complex life. The Hadean period features the formation of the Milky Way and the first stages of Earth. The Archean period features the cooling of the Earth, the formation of water in the atmosphere and the creation of the first life forms. The Proterozoic period features the creation of oxygen in the Earth's atmosphere and the further evolution of life.
The Precambrian time period was a brutal time in Earth's history. Beginning with the formation of the planet from gas and space dust and lasting to the first formation of life with single cell algae, this time period ultimately shaped the planet as it is known today.Learn more in Ancient History
The Virtual Fossil Museum states that Precambrian fossils mostly derive from organisms called stromatolites. Stromatolites are presumed to be among the world's oldest fossils. The existence of stromatolites is important, because stromatolite fossils are a window into the earth's distant past that allows scientists to understand the foundation of evolution.Full Answer >
Plants and animals that became extinct during the Precambrian Era include acritarchs and Ediacara biota. These were soft-bodied organisms. Animals such as Namacalathus and Cloudina also became extinct in the Precambrian Era.Full Answer >
Astrophysicists believe the Earth and the rest of the solar system is the result of the Big Bang and its explosions of massive stars. The Big Bang and the stellar explosions, called supernovas, blasted untold amounts of material into space. Eventually, the matter cooled down and began to clump together into a hot, spinning cloud that eventually became a solar nebula.Full Answer >
The people who thought the Earth was flat believed so because they did not know about gravity, and assumed that the flatness was the reason they did not fall off the planet. There is disagreement among historians concerning when civilizations began to view the Earth as round.Full Answer >