Date post: | 21-Jan-2016 |
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Igneous
Igneous Rock• Igneous rocks form when melted rock
from deep below the Earth’s surface cools and hardens.
• As it cools the minerals form crystals that looks like grains in the rock.
• Example: Granite
Igneous Rock• Some igneous rocks form when melted rock
flows onto the Earth’s surface through an opening called a volcano.
• This rock cools very quickly and has very small crystals, or none at all.
• Example: Obsidian, Basalt, and Pumice
Sedimentary
Sedimentary Rock• Sedimentary rocks form when
sediments are pressed together and harden.
• Sediments are bits of rock, soil, and once-living things.
• Example: Sandstone
Sedimentary Rock• Limestone is made of shells and skeletons of
ocean animals.
• Shale is the most common sedimentary rock. It is form from particles of clay.
Sedimentary Rock• Conglomerate forms from sediments of
different sizes
Metamorphic Rock
Metamorphic Rock• Metamorphic rocks are formed when
old rocks are changed into new rocks by heat and pressure.
• Igneous, Sedimentary, and Metamorphic rocks can all change into new rocks by heat and pressure.
• Ex.) Limestone changes to marble
Metamorphic Rock• Granite changes to Gneiss
Metamorphic Rock• Shale (SR) changes to slate (MR)…
that changes to schist (MR)