Igneous rocks are formed from the cooling of molten rock. Molten rock is rock that has been heated to such a high temperature that it melts into a liquid. The basalt which makes up the Giant’s ...

What happens to the composition of magma as it rises up ... and those with less than 45 percent are ultramafic. What type of igneous rocks has the greatest silica content? Rocks in the felsic group ...

The composition of the magma, including the amount of silica and the presence of various gases, also influences the types of minerals and textures found in the resulting igneous rocks. Thundereggs ...