BELL RINGER 1/7/16 What special characteristic/feature would you only find in sedimentary rocks?

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Presentation transcript:

BELL RINGER 1/7/16 What special characteristic/feature would you only find in sedimentary rocks?

IGNEOUS ROCKS

Igneous rocks form as a result of cooling and solidifying of rock material that was once molten. Lava: Molten rock material on earth’s surface Magma: Molten rock material inside of earth

Igneous rocks are classified based on where they formed In trusive ( In side of Earth) – underground from magma Examples: Granite Pegmatite Peridotite Gabbro

Ex trusive ( Ex ited Earth and is now on the surface) – at the surface from lava Examples: Basalt Rhyolite Pumice Scoria

FORMATION OF IGNEOUS ROCKS Solidification: Changing from a liquid to a solid Crystallization: Liquid to solid that causes crystals to form

COOLING RATE 1.Slow – magma cools slowly underground. This give crystals a chance to grow, resulting in larger crystals.

COOLING RATE 2.Fast – lava cools quickly at the surface because it is exposed to air and water****. This doesn’t allow crystals to grow, resulting in small crystals. **If cooling rate is really fast, no crystals grow, resulting in a glassy texture.

RELATIONSHIP BETWEEN COOLING RATE AND CRYSTAL SIZE Crystal sizeCrystal size Cooling Rate

IDENTIFYING IGNEOUS ROCKS 1.Determine Texture Coarse- Minerals visible to the naked eye Examples: Granite, Pegmatite, Gabbro Fine- Need magnification to see minerals Examples: Basalt, Rhyolite, Andesite

IDENTIFYING IGNEOUS ROCKS 2.Use grain size to determine texture

IDENTIFYING IGNEOUS ROCKS 3.Check color and density for composition

IDENTIFYING IGNEOUS ROCKS 4.Use chart for mineral composition

Concepts-For-Middle-School/section/3.8/ Concepts-For-Middle-School/section/3.8/ Lava Flow GoPro Lava entering the ocean Smart or not so smart?