on April 4, 2022
What is continental drift Pangea?
GeologyIn the early 20th century, Wegener published a paper explaining his theory that the continental landmasses were “drifting” across the Earth, sometimes plowing through oceans and into each other. He called this movement continental drift. Pangaea. What is continental drift and Pangaea? Alfred Wegener proposed that the continents were once united into a single supercontinent
on April 4, 2022
What is the neck of a volcano?
GeologyWhat is a volcanic neck? A volcanic neck is the “throat” of a volcano and consists of a pipelike conduit filled with hypabyssal rocks. What is formed in the neck of a volcano? A volcanic plug, also called a volcanic neck or lava neck, is a volcanic object created when magma hardens within a vent
on April 4, 2022
How do you read focal mechanisms?
GeologyThe darker-shaded quadrants of the focal mechanism indicate motion toward those quadrants; the lighter-shaded quadrants indicate motion away from those quadrants. The sense of slip on the fault and on the focal mechanism are shown with arrows. How do you read fault plane solution? https://youtu.be/ And the white ones the areas of dilatation corresponding to
on April 4, 2022
What tectonic plates were involved in the 2011 Christchurch earthquake?
GeologyTectonic setting & Cause Regardless, the earthquake was created along a conservative plate margin where the Pacific Plate slid past the Australian Plate in the opposite direction. The earthquake occurred on a fault running off this major plate boundary. What plates were involved in the Christchurch earthquake 2011? The fault, later named the Greendale Fault,
on April 4, 2022
When was the last earthquake in DC?
GeologyWas there an earthquake in Washington, D.C. recently? There were no significant confirmed earthquakes in or near Washington DC in the past 24 hours. What year did DC have an earthquake? On August 23, 2011, a 5.8-magnitude earthquake struck near Mineral, Virginia, about 80 miles southwest of D.C. What Shomari and other people in the
on April 4, 2022
What is the smallest ocean basin?
GeologyThe Arctic OceanThe Arctic Ocean is the smallest of the world’s five ocean basins. A polar bear walks on the frozen surface of the Arctic Ocean. The freezing environment provides a home for a diverse range of creatures. With an area of about 6.1 million square miles , the Arctic Ocean is about 1.5 times
on April 4, 2022
What is Deep Time anthropology?
GeologyWhat 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
on April 4, 2022
What is the Valley and Ridge region known for?
GeologySome 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
on April 4, 2022
What is an ammonite and when did it live?
GeologyAmmonites 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
on April 4, 2022
Why are some vents white smokers and some black smokers?
Geology“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