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Bronze Age
The Bronze Age is a period in a civilization's development when the most advanced metalworking consisted of techniques for smelting copper and tin from naturally occurring outcroppings of ore, and ... > more -
Indigenous peoples of the Americas
The term indigenous peoples of the Americas encompasses the inhabitants of the Americas before the arrival of the European explorers in the 15th century, as well as many present-day ethnic groups who ... > more -
Triceratops
Triceratops, meaning "three-horned face", because it had three horns was a ceratopsid herbivorous dinosaur genus from the Latest Cretaceous period of what is now North America. It lived at around the ... > more -
Pelycosaur
The pelycosaurs were smallish to large (up to 3 meters or more) primitive Late Paleozoic synapsid reptiles. They appeared during the Late Carboniferous and reached their acme in the early part of the ... > more -
Brachiosaurus
The Brachiosaurus is a famous dinosaur that lived during the Jurassic period. One of the largest ever dinosaurs to walk the earth, it has become a famous animal synonymous with dinosaurs, and is ... > more -
Lithosphere
The lithosphere is the solid outermost shell of a rocky planet. On the Earth, the lithosphere includes the crust and the uppermost layer of the mantle (the upper mantle or lower lithosphere) which is ... > more
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