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Our Rockin’ World

Our Rockin’ World. Jeri Gannon-Jacobsen. By:. Types of Rocks. Igneous. This kind of rock is made from molten (liquid) rock which hardens. The rate (speed) at which it cools and hardens as well as the minerals that make it up affect its appearance.

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Our Rockin’ World

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  1. Our Rockin’ World Jeri Gannon-Jacobsen By:

  2. Types of Rocks

  3. Igneous • This kind of rock is made from molten (liquid) rock which hardens. The rate (speed) at which it cools and hardens as well as the minerals that make it up affect its appearance. • That must have been some volcano that created those mountains!

  4. Sedimentary • This type of rock is formed from small fragments (pieces) of pre-existing rocks and/or organic materials which settle together in layers. These layers harden to form new rock. • Can you see those layers?

  5. Metamorphic • This type of rock is made from other types of rock which are changed by heat and pressure to form a whole new rock. • See how the rock is all bent and twisted from the heat and pressure--cool, huh?

  6. The Rock Cycle • Everyday, little pieces of the mountain rock are worn away by erosion (water and wind are just some examples). Those pieces collect and are made into new rocks called sedimentary rocks. They will then continue to change and become different rocks called metamorphic rocks. They could also change by becoming melted material that can form new igneous rock. Then the process will begin all over again. The rock cycle continues today.

  7. Our Changing Earth: Volcanoes • Volcanoes are usually cone-shaped mountains or hills--produced by lava and other things, such as ash, rising to the surface of the Earth and accumulating near a vent. Lava is molten material that has erupted onto the surface. Magma is molten material within the Earth.

  8. Review Questions • What type of rock is created from melted rock that cools and hardens? • What is melted rock called that does not reach the surface? • What type of rock is conglomerate? (Hint: It looks like a bunch of other rocks and stuff stuck together.)

  9. References Rocks and Minerals Slide Show http://volcano.und.nodak.edu/vwdocs/vwlessons/lessons/Slideshow/Slideindex.html Great Pictures! Introduction to Geology http://www.ship.edu/~cjwolt/geology/index.html Everything you ever wanted to know and more Rocks and Minerals http://www.peel.edu.on.ca/~havenwd/rocks.htm#Types%20of%20Rock Site with student friendly info Volcano National Park http://hawaiibeach.com/v.html Volcano pictures

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