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The Earth was molten
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Meteors fell on the planet where water was formed. Water came from the asteroids.
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Water on the Earth condensed and it rained for millions of years. Undersea volcanic activity formed granite which later formed the continents.
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The continents were formed. Single-celled life forms appeared. Stromatolites produce oxygen. Algae make photosynthesis.
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Oxygen rusted the iron. Oxygenation made the oceans and the skies blue. Fresh-water creatures appeared. Oceanic plates moved the continents
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The continents collided and created a super-continent (Rodinia). The Earth was mostly desert and there was no life.
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Rodinia blocked warm currents. The Earth froze. Marine bacteria and algaes were trapped underneath ice and 95% of the species died.
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Volcanic eruptions broke Rodinia apart.
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The greenhouse effect melted the ice.
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There was no more ice. Primitive organisms became complex. The Cambrian explosion happened. The first carnivorous animals appeared. Oxygen reached high levels and created an ozone layer in the atmosphere protecting life from UV rays
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The Ordovician is best known for its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts During the Ordovician, most of the world's land was collected together in the super-continent Gondwana. Throughout the Ordovician, Gondwana moved towards the South Pole where it finally came to rest by the end of the period.
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The three northern continents collided, forming the new supercontinent, Euramerica. The dominating species were marine species (corals,Agnatha, Romudina, Placoderm).Eurypterids were the apex predators of the Silurian oceans.
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The supercontinent Gondwana occupied most of the Southern Hemisphere, although it began significant northerly drift during the Devonian Period.Placoderms (the armored fishes) underwent wide diversification and became the dominant marine predators. Lycophytes, horsetails and ferns grew to large sizes and formed Earth’s first forests. Arthropod fossils are concurrent with the earliest plant fossils of the Silurian.
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The Earth was mostly covered in swamps. Coal formed from plant matter because of fresh water. Oil and gas resulted from dead marine animals. First enormous insects, amphibians, reptilians appeared. This period is characterized by the first complete modern biosphere.
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Pangaea was formed. First dinosaurs appeared. Although many people, think that they were cold-blooded, scientists have proved that their blood was lukewarm. In combination with big quantities of oxygen and carbon dioxyde, this caused them to grow to enormous sizes.
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In Siberia mantle eruptions took place for a million years. They formed poisonous gases and 95% of species died.
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Continents moved away. Earth was mostly covered in tropical forests.
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It was characterized by enormous volcanic eruptions. Diamonds were formed. It ended 65 million years ago with the K-T extinction. 65% of all species disappeared. Iridium was found which proves the extinction was caused by an enormous meteor. Also, the lava resulted from volcanic eruptions form toxic dust that killed the dinosaurs.
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The Swiss Alps were formed by the collision between Africa and Europe. Erosion and uplift took place. The Grand Canyon was formed. Quartz appeared.
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The first ancestors of humans appeared. It was the period of the Ice Ages. The ice melted 10 thousand years ago and formed the Great Lakes
