review#5 rocks
DESCRIPTION
EARTH SCI REVIEWTRANSCRIPT
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L.O: REVIEW IGNEOUS, SEDIMENTARY AND METAMORPHIC ROCKS
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ROCKS: PIECES OF THE LITHOSPHERE (SOLID PART OF EARTH) MADE OF MINERALS
THERE ARE THREE KINDS OF ROCKS: IGNEOUS, SEDIMENTARY AND
METAMORPHIC ROCK.
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ROCKS ARE CLASSIFIED (GROUPED) BY HOW THEY FORMED
• IGNEOUS ROCKS: formed when MOLTEN ROCK (magna/lava) cools and solidifies.
• SEDIMENTARY ROCK: FORMED FROM THE COMPACTION AND CEMENTATION OF SEDIMENT (ROCK) PARTICLES.
• METAMORPHIC ROCK: FORMED BY HEAT AND PRESSURE APPLIED TO EXISTING ROCKS.
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IGNEOUS ROCKS
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IGNEOUS ROCKS: FORMED BY THE SOLIDIFICATION & CRYSTALIZATION OF MOLTEN ROCK
IGNEOUS ROCKS: formed when MOLTEN ROCK (magna/lava) cools and solidifies.
Mineral crystals form as the molten rock cools.
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Intrusive igneous rocks versus extrusive igneous rocks
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Intrusive igneous rocks:
When MAGMA coolsVEEEERRRRYYY SLOOOOWLY INSIDE the earth, the igneous rocks formed are called
INTRUSIVE IGNEOUS ROCKS.
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Intrusive igneous rocks have:
LARGE CRYSTALS AND COARSE OR VERY COARSE TEXTURE.
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extrusive igneous rocks:
When LAVA cools VERY VERY QUICKLY OUTSIDE the Earth FROM OUT OF A VOLCANO, the igneous rocks
formed are called EXTRUSIVE IGNEOUS ROCKS.
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EXtrusive igneous rocks have:
SMALL CRYSTALS OR LOOK LIKE BLACK GLASS (NO CRYSTALS). HAVE FINE TEXTURE OR GLASSY TEXTURE.
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MAFIC IGNEOUS ROCKS VERSUS FELSIC IGENEOUS ROCKS.
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MAFIC IGNEOUS ROCKS VERSUS FELSIC IGENEOUS ROCKS.
• ROCKS are made of minerals.• Rocks made from dark, high density minerals (iron
(Fe) & magnesium(Mg) ) are MAFIC.
• Rocks made from light color, low density minerals
( Feldspar, silicon and aluminum ) are FELSIC.
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YOU MUST BE ABLE TO USE ESRT PAGE 6 to identify igneous rocks.
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All the igneous rocks that you might see the regents are the ones below:
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Now turn to page 81 of your green work book complete the questions.
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SEDIMENTARY ROCK:
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SEDIMENTARY ROCK: almost always form in a water environment from THE COMPACTION AND CEMENTATION OF SEDIMENT (ROCK) PARTICLES.
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Sediment (rock particles) get deposited, buried, compacted and cemented together. Fossils are
usually only found in sedimentary rocks.
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SEDIMENTARY ROCK: formed from THE COMPACTION AND CEMENTATION OF
SEDIMENT (ROCK) PARTICLES.
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Turn to ESRT page 7: these are the only possible sedimentary rocks you MAY see
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Turn to page 89 of your green workbook complete the typical sedimentary rocks
questions.
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METAMORPHIC ROCK:
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METAMORPHIC ROCK: FORMED BY HEAT AND PRESSURE APPLIED TO EXISTING ROCKS.
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There are two types of metamorphism: regional and contact
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Regional metamorphism: metamorphic rock formed deep underground by heat and pressure.
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contact metamorphism: metamorphic rock formed when the heat of magma/lava touches rocks.
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Foliated metamorphic rocks: minerals are aligned in thick bands.
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DISTORTED BANDING IN METAMORPHIC ROCK
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ESRT PAGE 8 SHOWS THE SCHEME TO ID METAMORPHIC ROCKS.
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NOW COMPLETE PAGE 96 ON METAMORPHIC ROCKS.
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THE ROCK CYCLE: THROUGH GEOLOGICAL FORCES, ROCKS CAN TRANSFORM INTO EACH
OTHER.
COMPLETE PAGE 78.