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.

The Rock Cycle Song

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

LavaExtrusive RockSmall Crystals

Large Crystals

Inside Earth

At or near surface

Fine GrainedCoarse-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? https://

www.youtube.com/watch?v=Bvj2URpgRc8

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

LavaExtrusive RockSmall Crystals

Large Crystals

Inside Earth

At or near surface

Fine GrainedCoarse-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 GravelBuildings Cleaning Streets PolishingBridges Gardening

Mount Rushmore –more informationhttps://www.youtube.com/watch?v=0Cq7MNqujZg

Closing

One Sentence Summarizer:

Students will compose one sentence summarizing the day’s lesson.