The eruption of volcanoes. If the lava flow is still underground and not exposed to air, its called Magma. Once it reaches the surface and encounters air, its called lava. Essentially, Magma and Lava are the same, there's no chemical difference other than its interaction to air.
The Earth's mantle is vastly more solid than molten due to large pressures exerted on the rocks from all sides. Molten material in the mantle can occur at hot spots and mid-ocean ridges where decompression of the rising rock allows melt, and at subduction zones where cold, wet crustal material may cause a partial melt of the surrounding mantle rock.
Micro seismicity, an increase or change in the chemical composition of volcanic gasses and potentially deformation or bulging of the Earth's surface may all be evidence of magma being fed into a volcanic reservoir.
Magma erupts through the crust at fissures
The best evidence of crustal movement is provided by marine fossils found on a mountaintop.
All of the Earth's mantle is hot. And while some geologists believe that there are Mantle plumes (or hot spots) current evidence seems to support a view that mantle plumes do not exist. What causes magma to rise up from the lower crust and mantle is the convection of the mantle and therefore the places where most heat (and magma) is coming up to the surface is along the mid oceanic ridges.
what part of the earths contains the rocks
The lithosphere is where the brittle rock resides. Most of the rock of the mantle is ductile, yet solid.
Yes there are! That's why the plates move! It's caused by convection circulating the magma in the mantle creating currents!
plate tectonic and magma
heat and pressure
If it were molten, it would be called magma.
The Mantle. It is the largest and thickest layer in the earth. But this answer might not be actually true. Because the earth has all these layers and the mass is added up. -By Olivia Agbo A 12 year old. Thank you for your support.
That is correct. When magma travels from the mantle to the crust and reaches the surface, that is a volcano.
in the mantle above the slab
In small amounts, yes. Magma contains some hydrogen from water that has been subducted into the mantle.