on April 15, 2022
What type of rock created the first continents?
Regional Specificsigneous protolithpartial melting of an older igneous protolith; however, both the composition of the protolith and its tectonic affinity are controversial. Field and analytical studies suggest that the early continents were formed by partial melting of oceanic crust in primitive subduction zones. What type of rock made the first continents? basalts The Earth’s oldest continental
on April 15, 2022
What type of earthquake generates a tsunami?
Regional SpecificsMost tsunamis are generated by earthquakes with magnitudes over 7.0 that occur under or very near the ocean and less than 100 kilometers (62 miles) below Earth’s surface (earthquakes deeper than this are unlikely to displace the ocean floor). What type of earthquake produces tsunamis? The earthquake must be a shallow marine event that displaces
on April 15, 2022
When was the Washington monument damaged by an earthquake?
Regional SpecificsAugust 23, 2011August 23, 2011, a 5.8 magnitude earthquake, occurred 84 miles southwest of Washington, D.C., damaging the Washington Monument. The National Park Service has temporarily closed the Monument and is assessing the damage to it. When did the Washington Monument reopen after the earthquake? Sept. 19 Washington Monument, closed for five of the past
on April 15, 2022
Is Dante’s Peak based on Mount St Helens?
Regional SpecificsThe volcanic inspiration for “Dante’s Peak” was the 1980 eruption of Mount St. Helens, which was used as a filming location for some scenes in the movie. “Dante’s Peak” is also strikingly similar to the 1981 movie “St. Helens,” which portrays a slightly dramatized story about the real event. Where is Dante’s Peak based? Dante’s
on April 15, 2022
What causes convection currents in the atmosphere?
Regional SpecificsConvection currents are created in the Earth’s atmosphere as the sun heats the gases, causing them to rise. Theses gases cool as they rise high into the atmosphere and travel back down towards the ground to get heated again. What are the main causes of convection currents in the asthenosphere? Convection occurs in the asthenosphere
on April 15, 2022
What are the three forces that cause plate motion?
Regional SpecificsConvection occurs in the mantle underneath Earth’s tectonic plates. Three forces act on the plates to make them move: basal drag from convection currents, ridge push at mid-ocean ridges, and slab pull from subducting plates. Convection currents in the mantle produce a force that causes motion called basal drag. What are three ways forces of