What is Deep Time anthropology?
Regional SpecificsWhat is the concept of deep time? “Deep time” refers to the time scale of geologic events, which is vastly, almost unimaginably greater than the time scale of human lives and human plans. How was deep time originally described? The concept of “deep time” dates back to 18th-century geologist James Hutton, who proposed that Earth
What is the Valley and Ridge region known for?
Regional SpecificsSome of the most scenic features of the Valley and Ridge province occur where rivers and streams cut through ridges to form narrow water gaps. Most notable of these include the Delaware and Susquehanna Rivers which are flanked in places by cliffs reaching 300 m (1,000 ft). Why is the Ridge and Valley important to
What is an ammonite and when did it live?
Regional SpecificsAmmonites lived during the periods of Earth history known as the Jurassic and Cretaceous. Together, these represent a time interval of about 140 million years. How did the Ammonite live? Where did ammonites live? Ammonites lived all around the world. Like their modern-day cephalopod relations, they were exclusively ocean-dwelling. They tended to live in more
Why are some vents white smokers and some black smokers?
Regional Specifics“Black smokers” are chimneys formed from deposits of iron sulfide, which is black. “White smokers” are chimneys formed from deposits of barium, calcium, and silicon, which are white. Underwater volcanoes at spreading ridges and convergent plate boundaries produce hot springs known as hydrothermal vents. Are white smokers or black smokers hotter? White smokers typically occur
Where is the Popigai crater?
Regional SpecificsSiberia, RussiaSiberia, Russia, is tied with the Manicouagan Crater as the fourth largest verified impact crater on Earth. A large bolide impact created the 100-kilometre (62 mi) diameter crater approximately 35 million years ago during the late Eocene epoch (Priabonian stage). Where is the crater that hit Earth? Chicxulub crater Impact crater/structure Coordinates 21°24′0″N 89°31′0″WCoordinates:
How many seamounts are in the Hawaiian chain?
Regional Specifics80over 80 identified undersea volcanoes, stretches about 6,200 km (3,900 mi) from the Aleutian Trench in the far northwest Pacific to the Lōʻihi Seamount, the youngest volcano in the chain, which lies about 35 kilometres (22 mi) southeast of the Island of Hawaiʻi. Are the Hawaiian Islands seamounts? The Hawaiian Islands were formed by volcanic