In the long geological history of the Earth, humans first appeared during the Pleistocene Epoch, which dates back 1.6 million years to 10,000 years ago. Humans in modern form arrived during the Pleistocene Epoch, although human-like creatures appeared in the period just before the Pleistocene, called the Pilocene Epoch, which dates back 5 million years ago to 1.6 million years ago.Know More
The Pleistocene Epoch gave rise to many types of plants and animals on Earth in addition to humans. Species emerging during that time include the woolly mammoth, conifers, mosses and many types of insects. Remains of the woolly mammoth trace its origins back to the cold northern regions of Russia. The mammoth survived the Pleistocene Epoch, but ultimately faced extinction. Many plants and trees emerging during that time showed resilience, however.
The Pleistocene Epoch ushered in life forms including large mammals and birds. Saber-toothed tigers, ground sloths, bison, horses and camels arose during this time. Many birds, including raptors and teratorn birds, which boasted wingspans exceeding 25 feet also can be traced to this period.
Many species of plants and animals enjoyed growth during the Pleistocene Epoch. This includes humans, whose populations spanned much of the world by the end of that epoch.Learn more about Geology
Erosion affects the environment by stripping away top soil on agricultural land, damaging delicate coastal areas, causing health problems in humans and contaminating bodies of water with sediment that can harm plant and animal life. Erosion damages farm land by removing nutrient-rich soil needed to grow plants and by exposing lower-quality soil. It also damages crops and causes greater runoff of needed water.Full Answer >
Rocks are important because geologists use evidence from them to learn about what the Earth was like in the past. They allow scientists to build a historical record of the planet to learn what events occurred before people lived.Full Answer >
Painite is believed to be the rarest mineral on Earth. By 2005, only 25 specimens had been found worldwide, though thousands of specimens were discovered in 2012. The mineral was discovered in the 1950s in Myanmar by mineralogist Arthur Pain.Full Answer >
Earth is geologically active because its internal heat keeps the outer core and lithosphere molten, encouraging plate movement and volcanic activity. Earth's crust consists of tectonic plates floating atop the malleable mantle, which in turn rises and falls over the semi-liquid outer core. The intense heat forces molten rock up toward the surface, creating new crust and driving intense geologic activity.Full Answer >