ROCKS & MINERALS https://www.youtube.com/watch?v=jP gE74Vltdc.

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Presentation transcript:

ROCKS & MINERALS gE74Vltdc

 Lesson: Igneous rocks are formed when the magma from a volcano cools- Sedimentary rocks form when eroded earth and other materials settle in layers. These layers press down over time to form solid rock. Metamorphic rocks are igneous or sedimentary rocks that have been changed by high temperatures or extreme pressure.  Well there's three types of rocks, In geology, Three types in geology... IGNEOUS, METAMORPHIC, AND SEDIMENTARY! Well there's three types of rocks, In geology, Three types in geology...

WHAT ARE ROCKS?  Rock is the basic material of which Earth’s crust is made.

WHAT KINDS OF ROCKS ARE THERE?  There are three main classes of rock:  Igneous, sedimentary, and metamorphic.

IGNEOUS  Igneous rock forms when magma, which is melted rock found deep inside the earth, cools and becomes solid. If magma reaches the surface, like when a volcano erupts, it is called lava.

EXAMPLES OF IGNEOUS ROCKS:  Basalt-This forms when lava cools and it looks like a six sided column. (Wyoming-Devil’s Tower)

EXAMPLES OF IGNEOUS ROCKS  Granite-this rock forms from the slow crystallization of magma below Earth’s surface. It is composed mainly of quartz, feldspar, and mica. (Yosemite National Park-Half Dome)

SEDIMENTARY  Sedimentary rock can take millions of years to form. Layers of sediment, which are loose materials such as mud, sand, or small pieces of rock, will pile up over time. The weight of the layers will cause the bottom layers to join together and form solid rock.

EXAMPLES OF SEDIMENTARY ROCK:  Sandstone- This rock has a lot of sand and small grain sized minerals. It can be found near beaches and deserts.  (Arizona- Grand Canyon)

EXAMPLES OF SEDIMENTARY ROCKS  Limestone-this type of rock is made up of skeletal fragments of marine organisms such as coral.  (Philippines- Limestone Cliff)

METAMORPHIC  Metamorphic rocks are formed when one rock is changed into another. This happens when the original rock is heated or squeezed deep under the ground.

EXAMPLES OF METAMORPHIC ROCK:  Gneiss: this rock is shale or granite that has been changed by great pressure and heat. (Scotland: Laxford Front)

EXAMPLES OF METAMORPHIC ROCKS  Slate- this rock was a sedimentary rock called shale. It is composed of clay and volcanic ash. (Utah- Provo River)