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uhh
im not quite sure how to put this into a timeline but i am going to start off with 1/1/1 as the starting date. -
the nature of magma
once formed a magma body buoyantly rises toward the surface because it is less dense than the surrounding solid rock. magma is completely or partly molten rock which on cooling solidifies to form an igneous rock composed of silicate minerals. Moat magmas consist of three distinct parts
a liquid componet, a solid componet, and a gaseous phase. -
from magma to crystalline rock
to better understand how magma crystallizes let us consider how a simple cystalline solid melts. when the ions in a rock heat up and vibrate more rapidly and conequently collide with ever increasing vigor. in the process called crystallization cooling reverses the events of melting. -
igneous processes
igneous rocks form in two different settings. magma may crystallize at depth or lava may solidify at earths surface. when magma loses its mobility before reaching the surface it eventually crystallizes to form intrusive igneous rocks also known as plutonic rocks. igneous rocks that form when molten rock solidifies at the surface are classified as extrusive igneous rocks also called volcanic rocks. -
igneous compositions
chemical analyses show that silicon and oxygen are by far the most abundant constituents of igneous rocks.
