|
Here, magma leaves the interior of the Earth (but not too far down---magma does not come from the core as some people think---it comes from the bottom of the crust and the mantle), and comes to the surface. Another place is at areas called hot spots.
|
www.newton.dep.anl.gov/askasci/env99/env295.htm
|
|
|
“ |
Magmas are not likely to come from the only part of the Earth that is in a liquid state, the outer core, because it does not have the right chemical composition. The outer core is made mostly of Fe with some Ni, magmas are silicate liquids....
http://www.tulane.edu/%7Esanelson/eens211/earths_interi...
|
|
|
The first question to address is: why does the magma erupt at all? ... As a general rule, the most explosive eruptions come from magmas that have high gas levels and high viscosity, while the most subdued eruptions come from magmas with low gas levels and low viscosity. Volcanic eruptions don't often fall into easy...
|
science.howstuffworks.com/volcano3.htm
|
|
|
|
How does magma form?; Magma forms because the rocks are at high temperature and pressure deep inside the earth. Actually, it is only a small percentage of the rocks that actually melts because it requires so much energy to melt rocks...
|
www2.scholastic.com/browse/article.jsp?id=4889
|
|
|
“ |
Yes, the Earth does have hot rocks. That's just the truth - nothing to be ashamed of. Rock inside the earth is heated both by friction (because there might be 8 or 10 miles of rock laying on top of the rock in question) - and the middle of ...
http://answers.yahoo.com/question/index?qid=20080417160...
|
|
“ |
Magma is melted rock. Temperature underground increases with depth—at great enough depths, solid rock will melt and generate magma. Another source of heat comes from the decay of radioactive elements found in Earth’s mantle and crust. A dro...
http://www4.alief.isd.tenet.edu/cahowe/GMO/GMO%20Chapte...
|
|
WHERE DOES THE MAGMA COME FROM ? ... Please do not trespass, as this only serves to erode relationships with landowners and makes it difficult, and sometimes impossible, for people who come later to visit outcrops. In the example of Pilot Knob little can be gained by going to the top.
|
www.lib.utexas.edu/geo/ggtc/ch4.html
|
|
"We have discussed many deals and come to understand that this would be the most appropriate one for our team." ... The support from Magma Group, led by former Ford and Maserati executive Martin Leach, ends fears that the Honda-powered Super Aguri would be unable to take part in the Australian Grand Prix at Melbourne...
|
www.cnn.com/2008/SPORT/03/10/motor.aguri/index.html
|
|
Where does magma come from? Melted rock. ... Why does rock melt? Several factors can come into play: ... An important process of magma creation happens along subduction zones, where water gets in the nooks and crannies and fractures of oceanic lithosphere along the sea bottom, and then goes along for the ride where...
|
www.geojeff.org/course-materials/physical-geology-lab/l...
www.geojeff.org/course-materials/physical-geology-lab/lab-4-igneous-rocks/origin-of-magma
|
|
