Classification of Metamorphic Rocks High school Earth Science.

1. Metamorphic RocksMetamorphic Rocks
FORMED BY HEAT ANDFORMED BY HEAT AND
PRESSUREPRESSURE

2. OLDER ROCKS MAY BEOLDER ROCKS MAY BE
FORMED INTO A NEW TYPEFORMED INTO A NEW TYPE
OF METAMORPHIC ROCKOF METAMORPHIC ROCK

3. -- Metamorphic rocks can form fromMetamorphic rocks can form from
igneous, sedimentary or otherigneous, sedimentary or other
metamorphic rocks.metamorphic rocks.

4. EARTHQUAKES AND VOLCANICEARTHQUAKES AND VOLCANIC
ACTIVITY CAUSE HEAT ANDACTIVITY CAUSE HEAT AND
PRESSURE TO ACT ON ROCKS.PRESSURE TO ACT ON ROCKS.

5. - sometimes temperature and- sometimes temperature and
pressure are great enough to meltpressure are great enough to melt
rock, forming magma.rock, forming magma.

6. - sometimes pressure flattens- sometimes pressure flattens
mineral grains in rocks withoutmineral grains in rocks without
melting them.melting them.

7. - as pressure and temperature- as pressure and temperature
continue to increase over time, onecontinue to increase over time, one
type of rock can change into severaltype of rock can change into several
different metamorphic rocks.different metamorphic rocks.

8. CLASSIFICATION: 1. FoliatedCLASSIFICATION: 1. Foliated
texture: mineral grains flatten andtexture: mineral grains flatten and
line up in parallel layers or bands.line up in parallel layers or bands.

9. 2. Nonfoliated texture: mineral2. Nonfoliated texture: mineral
grains grow and rearrange but dograins grow and rearrange but do
not form layers.not form layers.

10. Foliated RocksFoliated Rocks
 Original Rock: shale (sedimentary)Original Rock: shale (sedimentary)
 Metamorphic Rock: slateMetamorphic Rock: slate

11. Foliated RockFoliated Rock
 Original Rock: granite (igneous)Original Rock: granite (igneous)
 Metamorphic Rock: gneissMetamorphic Rock: gneiss

12. Nonfoliated RockNonfoliated Rock
 Original Rock: limestone (sedimentary)Original Rock: limestone (sedimentary)
 Metamorphic Rock: marbleMetamorphic Rock: marble

13. Nonfoliated RockNonfoliated Rock
 Original Rock: sandstone (sedimentary)Original Rock: sandstone (sedimentary)
 Metamorphic Rock: quartzite (meltedMetamorphic Rock: quartzite (melted
sand)sand)

15. USES OF METAMORPHIC ROCK:USES OF METAMORPHIC ROCK:
1. blackboards, roofs, sidewalks,1. blackboards, roofs, sidewalks,
floors: slatefloors: slate

16. 2. building stone: gneiss, marble,2. building stone: gneiss, marble,
quartzitequartzite

17. 3. statues, tombstones: marble3. statues, tombstones: marble
AND GRANITEAND GRANITE