1. Section 3 Igneous Rock Features

2. http://canarygeog.canaryzoo.com/Rocks Rocks.htm

3. Batholith Large, intrusive igneous rock Often granite or felsic composition

4. Sill Intrusive igneous rock forced between other layers Parallel to pre- existing layers Edinburg--Salisbury Crags

5. Dike Intrusive igneous rock forced between other rock Cuts across other rocks

6. Laccolith Intrusion between layers of sedimentary rock Often mound shaped at top

7. Volcanic Neck/Plug Magma that cooled in conduit of volcano Exposed by erosion of volcano Rhumsiki Peak, Cameroon

8. Problem Applying Math p 346 Classifying Igneous rocks 3 types of igneous rock based on silica content: –Granitic: More than 66% –Intermediate (Andesitic): 52%-66% –Basaltic: 45%-52%

9. A 900 kg block of igneous rock contains 630 kg of silica. What is its classification? What we know: –Total rock: 900 kg Silica: 630 kg Equation: –Percent = (Mass silica / Mass total) x 100 Put numbers in: –Percent = (630 kg/900 kg) x 100 Solve: –70% so it is _____________________