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.
