What happens when magma rises to the Earth's surface?

Answer 1

== == Magma reaches the surface through several processes. Volcanic rift zones exist where continental crust is being pulled apart. Faults along the rift zone may allow the hot, pressurized rock of the asthenosphere to melt and appear on the surface. Hot spots in the Earth's mantle can similarly cause melting and volcanism in the crust which is overlying them. The Hawaiian Islands were formed in this way. Finally there is plate subduction, where the more dense plate subducts, or goes under the less dense plate in a collision of two tectonic plates. The cold, wet subducting plate is melted when it reaches the mantle. The lighter magma then seeks to rise to the surface and may result in volcanism.

Answer 2

It forms a lava flow and in some cases a volcano. It generally cools to make a larger land mass such as the islands of Hawaii. In volcanos, it adds to the size and height of the original. In cases such as Mount St. Helens and Mt. Vesuvius, it builds up pressure and explodes with such great speed and force that people have no time to get to a safe area and lives are lost. Additionally:Magma rising out of the mantle does not always make it to the surface. Intrusive igneous rocks, such as granite, are solidified magma which has hardened underground, and may become exposed through uplift and/or erosion.

Answer 3

It cools and solidifies into a sedimentary rock.

Answer 4

When magma escapes from the mantle to the surface of the earth it causes a volcano. When it comes to the earth's surface it is referred to as lava.

Answer 5

THe magma cools and turns into solid rock(eventually)

Answer 6

It cools into extrusive igneous rocks.