Which type of igneous rock forms on the surface of Earth from lava? Intrusive OR Extrusive

 Metamorphic rocks form from other rocks due to intense heat and pressure***. There can be NO melting!  Metamorphic rocks are from recrystallization of unmelted material over a long period of time. This forms larger, denser crystals.

1. Regional – formed by forces acting over large areas, at great depth where extreme temperature*** and pressure exist.  High Pressure: caused by collisions of plates  A great region to find metamorphic rock is in mountains!

 Foliation: reorientation of mineral grains  Banding: concentration of minerals into zones of light and dark colors

2. Contact – occurs at regions where magma comes into contact with pre-existing rock.  High temperature changes the rock without melting

1. Foliated  Examples: Slate, Gneiss, Schist, Phyllite 2. Non-Foliated  Examples: Hornfels, Marble, Quartzite

1. Check for foliation 2. Check for grain size 3. Check composition 4. Use ESRT (page 7)

1. Marble – metamorphic form of limestone

2. Quartzite – from sandstone

3. Slate – usually from metamorphism of shale

 Phyllite – further metamorphism of slate

 Schist – foliated – contains layering, is easily broken

6. Gneiss – highly distorted – contains banding  Usually from granite

 Science Review Game- Mixed Rock Science Review Game- Mixed Rock