Search results
Results from the WOW.Com Content Network
In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium. Like an ordinary wave, a shock wave carries energy and can propagate through a medium, but is characterized by an abrupt, nearly discontinuous, change in pressure , temperature , and ...
Although a meteor may seem to be a few thousand feet from the Earth, [25] meteors typically occur in the mesosphere at altitudes from 76 to 100 km (250,000 to 330,000 ft). [26] [27] The root word meteor comes from the Greek meteĊros, meaning "high in the air". [23] Millions of meteors occur in Earth's atmosphere daily.
Also amphidrome and tidal node. A geographical location where there is little or no tide, i.e. where the tidal amplitude is zero or nearly zero because the height of sea level does not change appreciably over time (meaning there is no high tide or low tide), and around which a tidal crest circulates once per tidal period (approximately every 12 hours). Tidal amplitude increases, though not ...
Scientists believe they can find a meteor blast in Earth’s history strong enough to change the climate and, as a result, the animals that lived on Earth. Evidence may exist for a comet shockwave ...
[100] [101] The Chelyabinsk meteor was estimated to have caused over $30 million in damage. [102] [103] It is the largest recorded object to have encountered the Earth since the 1908 Tunguska event. [104] [105] The meteor is estimated to have an initial diameter of 17–20 metres and a mass of roughly 10,000 tonnes. On 16 October 2013, a team ...
Desert glass – natural glass found in deserts formed from the silica in sand as a result of lightning strikes or meteor impacts. Differentiated – a meteorite that has undergone igneous differentiation. (See: achondrite) Differentiation – usually the process of a planetesimal forming an iron core and silicate mantle.
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky.