1. Igneous Rocks Pages 99 - 113

2. Goal 1 Compare and contrast intrusive and extrusive igneous rocks

3. All rocks are a mixture of minerals. Mineral soup

8. Kalapana, Hawaii 1990

9. Lava fountain height approx 10 m Pu‘u Kahaualea , photo by J.D. Griggs, 02/25/83 USGS

15. Photo credit: Wing-chi Poon at Devil's Lookout Point, Black Canyon Gunnison National Park, Colorado, USA

18. Granite porphyry: coarse grains surrounded by fine grains

19. Goal 3 Explain the 4 factors that affect how rocks melt and crystallize

28. SiO 2 content is related to classification Dark / Green Ultramafic 0% Dark Mafic < 50% Basaltic ½ light ½ dark Intermediate ~ 60% Andesitic Light Felsic > 70% Rhyolitic General color Classification SiO 2 content Magma type