Question

classify igneous rock based on their origin and give example each?​

Answer 1

Answer:

In geology, the term sial refers to the composition of the upper layer of Earth's crust, namely rocks rich in aluminium silicate minerals. It is sometimes equated with the continental crust because it is absent in the wide oceanic basins, but 'sial' is a geochemical term rather than a plate tectonic term.

Answer 2

1. Explanation: Igneous rocks may be divided into two categories. Intrusive plutonic rocks crystallize from magma beneth the earth's surface. Extrusive or volcanic rocks crystallize from lava at the earth's surface.