on April 15, 2022
Is pumice felsic intermediate or mafic?
GeologyANDESITE Andesite is an extrusive volcanic rock with a composition that is intermediate between basalt and rhyolite.…Classification of Igneous Rocks. TEXTURE Vesicular Felsic Pumice Intermediate Scoria Mafic Scoria Is pumice intermediate? Pumice is a highly vesicular pyroclastic igneous rock of intermediate to siliceous magmas including rhyolite, trachyte and phonolite. Pumice is usually light in colour
on April 15, 2022
What is a moraine landform?
GeologyWhat type of landforms are moraines? Moraines are accumulations of dirt and rocks that have fallen onto the glacier surface or have been pushed along by the glacier as it moves. The dirt and rocks composing moraines can range in size from powdery silt to large rocks and boulders. What is a moraine and how
on April 15, 2022
Does rock friction cause seismic waves?
GeologyEarthquakes & Earth’s Interior. Earthquakes occur when energy stored in elastically strained rocks is suddenly released. This release of energy causes intense ground shaking in the area near the source of the earthquake and sends waves of elastic energy, called seismic waves, throughout the Earth. What can cause seismic waves? Seismic waves are caused by
on April 15, 2022
How long was the Anchorage earthquake 2018?
GeologyIt was followed six minutes later by a magnitude 5.7 aftershock centered 2.5 miles (4.0 km) north-northwest of the municipality. The earthquake could be felt as far away as Fairbanks.…2018 Anchorage earthquake. Damage to the Glenn Highway UTC time 2018-11-30 17:29:29 ISC event 616643636 USGS-ANSS ComCat Local date November 30, 2018 How long did the
on April 15, 2022
What rock is the asthenosphere made of?
GeologyThe Asthenosphere is made up of semi-plastic rock. Since the Lithosphere has a lower density, it floats on top of the Asthenosphere similar to the way in which an iceberg or a block of wood floats on water. The lower mantle below the Asthenosphere is more rigid and less plastic. Is the asthenosphere solid rock?
on April 15, 2022
Is a trench convergent or divergent?
Geologyconvergent plate boundariesconvergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench. Is trench a divergent? No, ocean trenches do not occur at divergent plate boundaries. They are formed at convergent boundaries. Is the
on April 15, 2022
What happens during a tsunami step by step?
GeologyAnswer 1: A tsunami has four general stages: initiation, split, amplification, and run-up. During initiation, a large set of ocean waves are caused by any large and sudden disturbance of the sea surface, most commonly earthquakes but sometimes also underwater landslides. What are the three steps of a tsunami? The life of a tsunami is
on April 15, 2022
What are the five eras in Earth’s history?
GeologyGeological Eras Cenozoic Era: Topic. Last major division of geologic time lasting from 65 million years ago to the present. … Mesozoic Era: Topic. [Gr.,=middle life], major division of geologic time (see Geologic Timescale, table) from 65 to 225 million years ago. … Paleozoic Era. … Precambrian: Topic. … Archean Eon. … Proterozoic Eon. What
on April 15, 2022
What is the largest source of liquid freshwater on Earth?
Geologygroundwatergroundwater and estimated that it is equivalent to a lake 180 metres deep covering the entire Earth. This makes groundwater the largest active freshwater resource on the planet. What are the largest sources of Earth’s liquid water? The ocean holds about 97 percent of the Earth’s water; the remaining three percent is found in glaciers
on April 15, 2022
What is Rodinia supercontinent?
GeologyWhat was the supercontinent called Rodinia? Rodinia (from the Russian родина, rodina, meaning “motherland, birthplace”) was a Neoproterozoic supercontinent that assembled 1.1–0.9 billion years ago and broke up 750–633 million years ago. Valentine & Moores 1970 were probably the first to recognise a Precambrian supercontinent, which they named ‘Pangaea I’. Is Rodinia a Pangea? Rodinia