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The Grand Canyon ( Hopi: Öngtupqa, [2] Yavapai: Wi:kaʼi:la, Navajo: Bidááʼ Haʼaztʼiʼ Tsékooh, [3] [4] Southern Paiute language: Paxa’uipi, [5] Spanish: Gran Cañón or Gran Cañón del Colorado) is a steep-sided canyon carved by the Colorado River in Arizona, United States. The Grand Canyon is 277 miles (446 km) long, up to 18 miles ...
The age of Earth is estimated to be 4.54 ± 0.05 billion years (4.54 × 10 9 years ± 1%). This age may represent the age of Earth's accretion, or core formation, or of the material from which Earth formed.
Early world maps. The earliest known world maps date to classical antiquity, the oldest examples of the 6th to 5th centuries BCE still based on the flat Earth paradigm. World maps assuming a spherical Earth first appear in the Hellenistic period. The developments of Greek geography during this time, notably by Eratosthenes and Posidonius ...
Earth's western hemisphere showing topography relative to Earth's center instead of to mean sea level, as in common topographic maps Earth has a rounded shape , through hydrostatic equilibrium , [85] with an average diameter of 12,742 kilometers (7,918 mi), making it the fifth largest planetary sized and largest terrestrial object of the Solar ...
The theory proposes that the Dialogues of Plato present an accurate account of geological events, which occurred in 9,600 BC, in the Black Sea-Mediterranean Corridor. Glacial melt-waters, at the end of the Younger Dryas Ice Age caused a dramatic rise in the sea level of the Caspian Sea. An earthquake caused a fracture, which allowed the Caspian ...
Two ice core temperature records; the Last Interglacial is at a depth of about 1500–1800 meters in the lower graph CO 2 concentrations over the last 400,000 years.. The Last Interglacial, also known as the Eemian (primarily used in a European context) among other names (including the Sangamonian, Ipswichian, Mikulino, Kaydaky, Valdivia and Riss-Würm) was the interglacial period which began ...
Greenhouse Earth. An illustration of ice age Earth at its glacial maximum. A "greenhouse Earth" is a period during which no continental glaciers exist anywhere on the planet. [6] Additionally, the levels of carbon dioxide and other greenhouse gases (such as water vapor and methane) are high, and sea surface temperatures (SSTs) range from 28 °C ...
The Greenland ice sheet is an ice sheet which forms the second largest body of ice in the world. It is an average of 1.67 km (1.0 mi) thick, and over 3 km (1.9 mi) thick at its maximum. [2] It is almost 2,900 kilometres (1,800 mi) long in a north–south direction, with a maximum width of 1,100 kilometres (680 mi) at a latitude of 77°N, near ...