Science - Geology

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Igneous Rocks:

Formation:

Appearance of these rocks are affected by what rate the lava cools and what substances it contains

The faster it cools, the less bubbles there are

Rocks formed from red-hot lava above the surface of the Earth's crust are called extrusive (Rocks that have erupted)

Extrusive Rocks:

Scoria,Obsidian,Basalt

Large bodies of intrusive rocks are called batholiths.

Rocks can differ depending on geological location

Intrusive Rocks:

Granite, Diorite, Gabbro, Kimberlite

An intrusive rock forms from magma that cooled slowly below the surface

Metamorphic Rocks:

Under pressure and heat other rocks under go a process called metamorphism

Sandstone > Quartzite

Shale > Slate

Lava 700-10000C

Metamorphism irreversible

Metamorphism is chemical reaction and changes the minerals

Rocks that do melt turn into igneous rocks

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