1. Metamorphic Rocks FORMED BY HEAT AND PRESSURE

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

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

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

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

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

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

8. METAMORPHIC ROCKS ARE CLASSIFIED BY CLASSIFICATION AND TEXTURE

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

10. 2. Nonfoliated texture: mineral grains grow and rearrange but do not form layers.

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

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

17. 3. statues, tombstones: marble AND GRANITE