Igneous Rocks Inside Earth Chapter 5.2 Pages 150-153 Igneous Rocks Form from Lava or Magma Made of mineral crystals Classified according to: Origin Texture Mineral Composition Origin of Igneous Rocks
Classified according to where they formed. Intrusive Extrusive Origin of Igneous Rocks Intrusive Forms when magma hardens beneath Earths surface Granite makes up most of the
continental crust. Origin of Igneous Rocks Extrusive Forms from lava that erupted onto Earths surface Basalt forms much of the ocean crust. Which is a way to identify if a rock is Igneous? A
Streak B Origin C Solid D Hardness
Porphyritic Both textures large AND small crystals. Cools slowly, then rapidly. No Crystals Rock cools too quickly for crystals to form. Lava cools quickly Forms smaller crystals.
Slowly cooling, large crystals Example: Granite Fine Grained Coarse Grained Igneous Rock Textures What is a Crystal? A solid in which the atoms are arranged in a pattern that repeats again and again. Igneous Rock Textures
Depends on the size and shape of its mineral crystals. Coarse Grained Porphyritic No Crystals Fine Grained No Crystals A
Coarse-grained B Fine-grained C Porphyritic D No visible crystals
A rock that has two kinds of texture is called Mineral Composition Most of Earths rocks contain silica (silicon dioxide, SiO2) High Silica (Felsic) Forms light colored rocks. Granite is dark to light gray, red and pink. Low Silica (Mafic)
Forms dark colored rocks. Basalt contains dark colored minerals. No quartz. Silica Content Felsic Mafic Granite Rhyolite
Basalt Gabbro Intermediate Diorite Andesite Igneous Rock Chart No Crystals Fine- Grained Porphyritic Coarse Grained Origin Extrusive (Lava)
Both Intrusive (Magma) Low Felsic (High) Density Silica Granite Continental
Crust High Mafic (low) Gabbro Large crystals with small crystals Scattered on top. Rhyolite Basalt
Ocean Crust Pumice Obsidian Which rock likely has the most silica? A B
C Uses of Igneous Rocks Granite - building materials Obsidian - sharp tools because Igneous rocks are useful they are hard, durable and dense Basalt - gravel, construction Pumice - used for cleaning and polishing
What to Work On Read the textbook, pages 150-153 Answer questions 1-4 on page 153 DUE: Friday, November 4th Project Topics
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