on April 15, 2022
Can minerals be human made?
GeologyAlthough minerals, by definition, must form via natural processes, Hazen’s team discovered 208 minerals mediated by humans—they did form naturally but in places such as man-made mines, where unnatural humidity or fires from mining operations created new minerals along the mine walls. Can humans make minerals? Humans can create artificial minerals, like synthetic gemstones, pure
on April 15, 2022
What does mineral replacement fossils mean?
GeologyIn another fossilization process, called replacement, the minerals in groundwater replace the minerals that make up the bodily remains after the water completely dissolves the original hard parts of the organism. Fossils also form from molds and casts. What is mineral replacement fossil? When a hard animal part (shell, bone, tooth) is buried, minerals in
on April 14, 2022
What process creates striations?
GeologyStriations are lines or scratches on rock surfaces, usually no more than a few millimeters in depth, produced by the process of glacial abrasion (Glasser and Bennett, 2004). What processes form striations? Glacial grooves and striations are gouged or scratched into bedrock as the glacier moves downstream. Boulders and coarse gravel get trapped under the
on April 14, 2022
What type of rock is siltstone?
GeologySiltstone Type Sedimentary Rock Texture Clastic; Fine-grained (0.004 – 0.06 mm) Composition Quartz, clay minerals Color Reddish brown Miscellaneous Massive; Feels slightly gritty Is siltstone igneous metamorphic or sedimentary? clastic sedimentary rock Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with
on April 14, 2022
How do volcanic eruptions affect the atmosphere?
GeologyVolcanoes can impact climate change. During major explosive eruptions huge amounts of volcanic gas, aerosol droplets, and ash are injected into the stratosphere. Injected ash falls rapidly from the stratosphere — most of it is removed within several days to weeks — and has little impact on climate change. How do volcanic eruptions affect the
on April 14, 2022
Do most earthquakes occur along existing faults?
GeologyEarthquakes Can Happen Along Intraplate Faults Earthquakes can occur along faults far from the edges of plates. Although these earthquakes are much less common, they are due to the same forces that cause earthquakes along plate boundaries. Do all earthquakes occur on faults? Earthquakes occur on faults – strike-slip earthquakes occur on strike-slip faults, normal
on April 14, 2022
What is stack and plume?
GeologyPlume refers to the path and extent in the atmosphere of the gaseous effluents released. from a source usually a stack (chimney) The behavior of a plume emitted from any stack depends on localized air stability. What is plume and its types? 1) Looping Plume: Occurs in super adiabatic environment. Unstable and need higher stacks.
on April 14, 2022
How long did the 2011 Virginia earthquake last?
Geology23, 2011, seismic waves shot out in all directions from a depth of four miles below the Earth’s surface about 35 miles northwest of Richmond, near Mineral, Va. The rumbling lasted less than a minute, but that’s all it took to freak out a citizenry unaccustomed to tremors. How long was the Virginia earthquake? The
on April 14, 2022
What did the Japanese call the fire tornadoes?
GeologyFire whirls were produced in the conflagrations and firestorms triggered by firebombings of European and Japanese cities during World War II and by the atomic bombings of Hiroshima and Nagasaki. What was the worst disaster in Japan? The date was September 1, 1923, and the event was the Great Kanto Earthquake, at the time considered
on April 14, 2022
What is polar wandering in geology?
Geologypolar wandering, the migration of the magnetic poles over Earth’s surface through geologic time. What causes polar wandering? An important hypothesis of paleomagnetism is that apparent polar wander, the motion of the paleomagnetic pole relative to a continent or plate, is caused entirely by plate motion relative to the mesosphere, which is the relatively stronger