EARTHSC 1G03 Lecture Notes - Lecture 6: Continental Crust, Plate Tectonics, Oceanic Crust
11 Sep 2018
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Southern ontario near lake huron and hudson"s bay) Magma is below the crust, but if it makes its way up through the crust, it becomes lava. While it is still melted, it is the same stuff as magma. Intrusive rocks are underneath and extrustive rocks are what make it up above the surface. If you melt rocks, they start moving because liquids are less dense than rocks in solid form. The slower a rock cools, the bigger the minerals. There"s more time for the crystals to form. Things cool fast in the air, and they cool fast in the water. Rocks hold heat for a really long time they are good insulators. Classification of igneous rocks texture: fine or coarse depending on how quickly magma cooled. Intrusive texture is called phaneritic, which means you can see grains without help, or with a hand lens (but you won"t need a microscope). Typical of volcanic island arcs and active continental margins.
