on April 16, 2022
Why is lava black?
GeologyRocks that cool quickly, especially the outer layers of a flow, are primarily composed of glass particles and tiny mafic minerals. This is why the outer surface of a flow is black. Why is the top of lava black? The black color comes from the magnesium and iron-rich minerals, which are present in almost all
on April 16, 2022
What is a pumice rock?
GeologyPumice is pyroclastic igneous rock that was almost completely liquid at the moment of effusion and was so rapidly cooled that there was no time for it to crystallize. When it solidified, the vapours dissolved in it were suddenly released, the whole mass swelling up into a froth that immediately consolidated. What is a pumice
on April 16, 2022
What is the continental crust and oceanic crust?
GeologyContinental crust is the crust under the land (aka the continents), and it’s made mostly from a rock called granite. … While continental crust is thick and light-colored, oceanic crust is thin and very dark. Oceanic crust is only about 3-5 miles thick, but continental crust is around 25 miles thick. What is a continental
on April 16, 2022
Is Venus still volcanically active?
GeologyA volcanic peak standing more than a mile high on Venus may still be active, new findings show, possibly shedding light on hotly debated findings that suggest that life may exist on the hellish planet. Venus has more volcanoes than any other planet in our solar system. Is Venus currently volcanically active? Recent volcanic activity.
on April 16, 2022
What is trace fossil in geology?
GeologyA trace fossil, also known as an ichnofossil ( /ˈɪknoʊfɒsɪl/; from Greek: ἴχνος ikhnos “trace, track”), is a fossil record of biological activity but not the preserved remains of the plant or animal itself. What is meant by a trace fossil? Definition of trace fossil : a fossil (as of a dinosaur footprint) that shows
on April 16, 2022
What is design basis earthquake?
Geologydesign-basis earthquake (DBE): “That earthquake for which the safety systems are designed to remain functional both during and after the event, thus assuring the ability to shut down and maintain a safe configuration.” What is MCE and DBE? The MCE (Maximum Credible Earthquake) is the most severe earthquake effects considered by this standard. The DBE
on April 16, 2022
How did Mount Teide form?
GeologyTeide is not merely the most visited national park in Spain and Europe. It is one of the most spectacular manifestations of volcanic activity on Earth, formed 120,000 years ago after a landslide caused by the eruption of the ancient Las Cañadas volcano. When was Teide formed? 170,000 years ago However, as Teide was formed
on April 16, 2022
Are cinder cone volcanoes common?
GeologyCinder cones are the most common type of volcano in the world. They may look like an idealized depiction of a volcano as they are steep, conical hills that usually have a prominent crater at the top. Are cinder cones The most common volcano? Cinder cones, also known as pyroclastic cones, are the smallest and
on April 16, 2022
How do you calculate the speed of a tsunami?
GeologyTsunami speed can be computed by taking the square root of the product of the acceleration of gravity, which is 32.2 feet (9.8 meters) per second squared, and water depth. In 15,000 feet (4,600 meters) of water, this works out to almost 475 mph (765 km/h). How do you calculate wave speed? Wave speed is
on April 16, 2022
What volcano has the most Lava?
GeologyWhat volcano produces most lava? Shield volcanoes Shield volcanoes, the third type of volcano, are built almost entirely of fluid lava flows. Flow after flow pours out in all directions from a central summit vent, or group of vents, building a broad, gently sloping cone of flat, domical shape, with a profile much like that