EARth by: yaphet solomon

The Big Bang was the explosion that started everything. The Big Bang occurred 13.7 billion years ago. All the matter, energy, and light; were all compacted into an infinitely dense point. The universe then expanded tremendously.

Galaxies were born when vast clouds of gas and dust collapsed under their own gravitational pull, allowing stars to form.

Solar system was formed when a cloud of gas and dust in space was disturbed, maybe by the explosion of a nearby star called a supernova. This explosion made waves in space which squeezed the cloud of gas and dust.

The Earth's core is the base of all living things on this planet. It is believed that the formation of the core was formed from a cloud of dust and gas and other materials that compressed together to create the core.

The Earth is thought to have been formed about 4.6 billion years ago by collisions in the giant disc-shaped cloud of material that also formed the Sun. Gravity slowly gathered this gas and dust together into clumps that became asteroids and small early planets called planetesimals.

After several million years Earth separated into layers. Iron, nickel and other heavy metals mostly settled to the core. Lighter elements remained in the mantle around the core. The lightest elements, such as oxygen and silicon, floated to the top and cooled, forming a solid crust.

As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today's atmosphere.

The ocean formed billions of years ago. Over vast periods of time, our primitive oceans formed. Water remained a gas until the Earth cooled below 212 degrees Fahrenheit . At this time, about 3.8 billion years ago, the water condensed into rain which filled the basins that are now our oceans.

the tectonic plates which surrounded the plates upon which Pangea sat, all began to converge over a period of a couple of billion years, gradually lifting just one huge land mass out of the ocean. Starting with Rodinia, Pannotia, Oldredia and finally Eramerica until the whole Pangaea land mass was raised above sea level.

Movements of tectonic plates create volcanoes along the plate boundaries, which erupt and form mountains. A volcanic arc system is a series of volcanoes that form near a subduction zone where the crust of a sinking oceanic plate melts.

All lakes fill bowl-shaped depressions in the Earth's surface, called basins. Lake basins are formed in several ways. Many lakes, especially those in the Northern Hemisphere, were formed by glaciers that covered large areas of land during the most recent ice age, about 18,000 years ago.

Most rivers emerge from underground streams, formed after rain or snow seeps into the ground then bubbles back to the surface. As the water flows downhill, the trickle swells into a stream and then, as side streams called tributaries join it, into a wider river.

The first multi-celled organisms on this planet did not appear until 600 million years ago.

Homo-sapiens did not appear on earth until about 200,000 years ago in the continent of Africa.

Credits:

Created with images by Filter Forge - "Luminous Cells" • James St. John - "Paranthropus boisei fossil hominid (Koobi Fora Formation, Lower Pleistocene, 1.75 Ma; Olduvai Gorge, western Arusha Region, northern Tanzania, eastern Africa) 1"

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