igneous rocks. granite is a very hard rock. it does not weather easily. it is mined from granite...

Igneous Rocks

Granite is a very hard rock. It does NOT weather easily. It is mined from granite

quarries.

Granite has many uses.

more uses

….and my favorite!

Igneous Rocks form from volcanoes.

• Intrusive• Cooled trapped

magma inside Earth• Cools slowly• Has crystals

• Extrusive• Cooled lava

outside of Earth• Cools quickly• Few, if any

crystals

Most igneous rocks are made of silicate materials.

• High silica composition makes a rock light colored. (Highlight – like a highlighter)

• Low silica composition makes a rock dark colored.

You decide.Intrusive or Extrusive Rock

orHigh Silica or Low Silica

Composition

Igneous Rock

Crystal Size (Large/many or Small/few)

Light or Dark

colored (Silica Content)

Intrusive or Extrusive/ High or Low Silica

DioriteGraniteObsidianPumiceGabbroBasaltAndesite

Set up a data table like this one.

Diorite

Granite

Obsidian

Pumice

Gabbro

Basalt

Andesite

Igneous Rock

Crystal Size (Large/many or small/few)

Light or Dark

(Silica Content)

Intrusive or Extrusive/ High or Low Silica

Diorite Large (many) Light Intrusive/highGranite Large (many) Light Intrusive/highObsidian none Dark Extrusive/nonePumice Few/none light Extrusive/highGabbro Large (many) Dark Intrusive/lowBasalt none Dark Extrusive/lowAndesite none light Extrusive/high

Check your responses.

What type of Igneous Rock is Stone Mountain?

You got it! You are a geologist – someone that studies the Earth!!!!

• Developed by C. Warren