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TYPES OF ROCK and THE ROCK CYCLE PowerPoint Presentation
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TYPES OF ROCK and THE ROCK CYCLE - PowerPoint PPT Presentation


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TYPES OF ROCK and THE ROCK CYCLE. IGNEOUS ROCK- formed when molten rock cools and solidifies. As the rock cools, minerals crystallize and grow. Extrusive igneous rock - cools quickly on the Earth ’ s surface (small crystals) Ex: Basalt, Obsidian

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TYPES OF ROCK and THE ROCK CYCLE


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IGNEOUS ROCK-formed when molten rock cools and solidifies. As the rock cools, minerals crystallize and grow.

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Extrusive igneous rock- cools quickly on the Earth’s surface (small crystals)

Ex: Basalt, Obsidian

Air bubbles are sometimes trapped (pumice, scoria)

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Intrusive igneous rocks- cools slowly under the Earth’s surface (large crystals)

Ex: granite, gabbro

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2. SEDIMENTARY ROCK- formed from compressed or cemented layers of sediment

*starts with rock being weathered (broken down) by wind/rain/ice

*then the sediments move to lakes and seas and sink

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Named based on the size of the fragments they contain:

Conglomerate = pebbles

Sandstone = sand

Mudstone = mud (if it’s flaky it’s called shale)

Limestone = made mostly of fossils and shells of sea creatures

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SEDIMENTARY ROCKS:

Sediments compacted and cemented

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3. METAMORPHIC ROCK- rock that changes form under heat/pressure deep within the Earth

* Heat and/or pressure is great over long amounts of time, but the rock does not melt.

Limestone --------> Marble