Happy Autumnal Equinox!!  Periods 1,2,4--Sign in to Edmodo and tell the class what you did over the break. Then glue in the rock cycle song.  3 rd period only—Just glue in the rock cycle song.

Hurricane tracking update

Welcome to our new topic ROCKS!  MYP Unit Question: What’s a world without rocks?  Area of Interaction: Human Ingenuity  Learner Profile: Thinker

 Standard: Investigate the scientific view of how the Earth’s surface is formed.  Learning Target: Today I am learning about igneous rocks because they give clues about the formation of the Earth.

 3 Major Groups of Rocks:  Igneous  Sedimentary  Metamorphic These terms refer to how the rocks in each group formed. 3 Types of Rock

Opening: Observations of an igneous rock

Igneous Rocks  From the Latin word igni (fire)  form from the cooling of molten rock (lava and magma).

Igneous rock Intrusive rock Magma Lava Extrusive Rock Small Crystals Large Crystals Inside Earth At or near surface Fine Grained Coarse-grained Cools fast Cools slowly

 How do Igneous rocks Form? from the cooling of molten rock (lava and magma Left Side Right Side

Are lava and magma the same?  LAVA is molten material found on the surface of the earth.  MAGMA is molten material found beneath the surface of the earth.

 What is Lava?  What is Magma?  molten material found on the surface of the earth.  molten material found beneath the surface of the earth. Left Side Right Side

Classified by Formation: Extrusive Rock is formed from lava erupted onto Earth’s surface. Exits the Earth (Basalt)

Classified by Formation: Intrusive Rock is formed when magma hardens beneath Earth’s surface. Inside the Earth (Granite)

 How does Extrusive Rock form?  How does Intrusive Rock form?  When lava erupts onto Earth’s surface  When magma hardens beneath Earth’s surface Left Side Right Side

How was Mount Rushmore made? 

Classified by Texture: Fast Cooling Lava (Extrusive) Fine-Grained, small crystals, smooth Slow Cooling Magma (Intrusive) Coarse-Grained, large crystals, rough

 How fast do these rocks cool?  Extrusive: Fast cooling lava (Fine-Grained or glassy texture.)  Intrusive: Slow cooling Magma. (Ex. Coarse- Grained, large crystals. Smooth & rough.) Left Side Right Side

An intrusive igneous rock would have what type of texture? Why? Coarse-Grained, large crystals. Smooth & rough. It is hotter in the earth than on the outside of the earth so it takes longer for magma to cool down.

Igneous rock Intrusive rock Magma Lava Extrusive Rock Small Crystals Large Crystals Inside Earth At or near surface Fine Grained Coarse-grained Cools fast Cools slowly

An extrusive igneous rock would have what type of texture? Why? Fine-Grained or glassy texture It is cooler on the surface of the Earth so the rocks can cool faster.

Classified by Mineral Composition: Mafic describes dark colored rocks because of low silica (basalt, peridotite) Felsic describes light colored rocks because of high silica (granite, rhyolite )

 Dark vs. Light Minerals?  Mafic describes dark colored rocks  Felsic describes light colored rocks Left Side Right Side

Mineral Composition Igneous Rocks Granite is made of: Feldspar, Mica, Quartz, Horneblende (dark) Rhyolite is made of: Feldspar, Mica, Quartz, Horneblende Obsidian is made of: Quartz, Iron, Magnesium

How do you use igneous rocks? Tools Gravel Buildings Cleaning Streets Polishing Bridges Gardening

Mount Rushmore –more information

Closing  One Sentence Summarizer:  Students will compose one sentence summarizing the day’s lesson.

Bell Ringer 9/2/14  If you where given this mineral how would you go about identifying it? Color: Blue-green Hardness: 6 Luster: Non-Metalic Streak: White Name: Lazulite