Category: Geology

How is halite mined?

Underground Halite deposits are often mined by drilling wells into the salt layer, and bringing in hot water which quickly dissolves the salt into a brine. The brine is saturated with dissolved salt and is then pumped out. The brine evaporates and the remainder salt crystallizes and is harvested. Where can halite be mined? Halite

Which clastic sediment has the smallest grain size?

ShaleShale has the smallest grain size. Shale is made mostly of clay-sized particles and hardened mud. When sediments settle out of calmer water, they form horizontal layers. Which type of clastic sediment has the smallest particle size? Clay is the category of clastic sediment with the smallest particle size. Which grains are smallest? Teff is

What is the viscosity of andesitic lava?

102 to 107 Pa s102 to 107 Pa s, which is due to a wide range in phenocryst contents from 0 (phenocryst‐free andesitic melt) to ∼50 vol % (50 vol % rhyolitic melt + 50 vol % phenocrysts). Does andesitic lava have low viscosity? Siliceous Lava Flows – High viscosity andesitic and rhyolitic lava flows,

What is the crystal form of a mineral?

Crystal form refers to the geometric shape of mineral crystals. Crystal form is caused by the symmetrical, three-dimensional arrangement of atoms inside the mineral. Not all minerals form perfect visible crystal shapes. Some crystals are too small to see. What are the 6 crystal forms of minerals? The six crystal families are triclinic, monoclinic, orthorhombic,

What countries are in the Great Rift Valley?

In Kenya, Uganda and the fringes of South Sudan, the Great Rift runs along two separate branches that are joined to each other only at their southern end, in Southern Tanzania along its border with Zambia. The two branches are called the Western Rift Valley and the Eastern Rift Valley. How many countries are in

What is Richter scale in geography?

The Richter scale measures the magnitude of an earthquake (how powerful it is). It is measured using a machine called a seismometer which produces a seismograph. A Richter scale is normally numbered 1-10, though there is no upper limit. What is the Richter scale simple definition? Richter scale (ML), quantitative measure of an earthquake’s magnitude

How does lava go away?

Does lava go away? There’s no way to stop lava. Once fissures open and the hot stuff starts flowing, it’s best not to fight nature. “The flows cannot be stopped, but people have tried in the past,” said Benjamin Andrews, director of the Global Volcanism Program at the Smithsonian National Museum of Natural History. How

What is a tectonic plate in geography?

A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest. What are tectonic plates GCSE? Tectonic plates are

Why does it rain after earthquake?

What happens to the surface after an earthquake? Earthquakes often cause dramatic changes at Earth’s surface. In addition to the ground movements, other surface effects include changes in the flow of groundwater, landslides, and mudflows. Earthquakes can do significant damage to buildings, bridges, pipelines, railways, embankments, dams, and other structures. Do earthquakes start underwater? A

Why are other mineral properties less useful for identification?

Why are other mineral properties less useful for identification? Because the properties can vary with different minerals. They can be deceiving. What are the classification of mineral? In this system, minerals are classified into eight main mineral groups based on chemical composition. These classes are: native elements, silicates, oxides, sulfides, sulfates, halides, carbonates, phosphates, and

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