Asked in Geology
Where is a place where magma wells up to the surface from Earth's mantle?
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Asked in Travel & Places, Volcanoes
A place where magma wells up to the surface from earth's mantle?
Where does magma and lava come from?
Lava is magma that reaches the surface. Magma originates either from rising plumes of heat at hot spots in the Earth's mantle, where decompression melting takes place as the hot rock nears the surface; or, it originates in the mantle from subduction of oceanic crust, where cold, wet rock speeds melting of the subducting rock and it rises toward the surface.
Where does magma form before it moves toward Earth's surface?
Asked in Earthquakes
What is a crack in earths surface where movement takes place?
Asked in Volcanoes
Where does the magma which feeds volcanos come from?
Magma originates either from rising plumes of heat at hot spots in the Earth's mantle, where decompression melting takes place as the hot rock nears the surface; or, it originates in the mantle from subduction of oceanic crust, where cold, wet rock speeds melting of the subducting rock and it rises toward the surface. Read more: http://wiki.answers.com/Q/Where_does_magma_and_lava_come_from#ixzz1mpH3pxn1
Asked in Volcanoes
Plume of heat from a fixed location beneath the earths surface?
Asked in Geology, Igneous Rock
What is the relationship between a change in the pressure on a rock and the production of magma?
As rising superheated mantle rock nears the surface due to tectonic forces, the compression pressure from surrounding rock decreases, causes it to melt, forming magma. It's called decompression melting. The high pressures that keep the superhot mantle rock from melting in the first place are called lithostatic pressures.
Asked in Earth Sciences, Plate Tectonics
Where is a place where currents of heated mantle rock move towords earths surface?
How does magma evolve?
Asked in Temperature
What happens to temperature and pressure as depth beneath earths surface increase?
Asked in Science, Earth Sciences
What place on the earth's surface has the lowest air pressure?
How a volcano begins?
It starts two ways. 1.Two tectonic plates move away from each other and magma goes through the space they leave forming a volcano. 2.Two tectonic plates move together and one slides under another dragging water into the mantle boiling the water which melts rock forming magma which rises to the surface forming a volcano. "But the place where volcanoes begin is in the deeper regions of the Earth's crust and uppermost layers of the mantle".
Asked in Volcanoes
Where can you find magma?
Magma is under the Earth's surface. A volcano is one place. Magma is formed largely at tectonic plate boundaries. One process is plate subduction, where one plate actually slips under its adjoining plate (a convergent boundary). The subducted plate is driven into the mantle deep within the earth, where it's so hot, the plate melts and forms magma in a chamber. The pressure builds and can eventually be ejected from a volcano. Its thought the earth cools the mantle layer with this process. The great Ring of Fire around the world along tectonic plate boundaries is where many of the world's volcanoes are situated, an example being Mount Saint Helens, which erupted in 1980.
Asked in Science
Is there any place on earth where materiel from the surface moves into earths interior and some of it melts?
Asked in Fossils
Why arent fossils found in extrusions and intrusions?
Asked in Geology, Rocks and Minerals
How rock change into metamorphic?
Rock changes into a metamorphic rock when the protolith (parent rock) goes through the process of metamorphism. During metamorphism the rock is subjected to high temperature and pressure which causes chemical and physical changes in the rock. The metamorphic process can take place under the earths surface or it can be caused by tectonic processes and also the intrusion of magma into the earths crust.