Today’s Agenda… 4-26 Bellringer: How do igneous rocks form? Finish notes from yesterday Notes on Metamorphic Rock Study Pack #3 Homework

Igneous Rocks How do igneous rocks form? What is the difference between intrusive and extrusive igneous rocks? How do basaltic, granitic, and andesitic rocks compare? Types of Igneous Rock

Metamorphic Rocks Study Pack #3 Page 67

Today’s Goals… I can describe the conditions in Earth that cause metamorphic rocks to form. I can classify metamorphic rocks as foliated or nonfoliated.

Metamorphic Rock Rocks that have changed because of changes in temperature and pressure or the presence of hot, watery fluids are called metamorphic rocks Change form, composition, or both Can form from igneous, sedimentary, or other metamorphic rock – parent rocks

Metamorphic Rock Do not form when rock melts, only when it is close enough to magma to be heated up

Metamorphic Rock Rocks are under great pressure from layers of rocks above them Temperature increases with depth in the Earth See it happen! http://www.classzone.com/books/earth_science/terc/content/visualizations/es0607/es0607page01.cfm?chapter_no=visualization

Metamorphic Rock Granite to Gneiss Shale to Slate

Metamorphic Rocks Sometimes hot fluids move through a rock and change its chemical composition Page 68, Figure 8

Classifying Metamorphic Rock Rocks can be classified based on their composition and texture Foliated Nonfoliated

Foliated Rocks Rocks have layers of mineral grains Example: slate and gneiss

Foliated Rocks Slate is used for paving pools and patios and roofing and tiling many surfaces

Nonfoliated Rocks Little or no layering Example: quartzite, marble