Igneous Rocks

With Mrs. Coates (and her 6-yr-old Son)Igneous Rocks

Rocks3 Types of Rocks:IgneousSedimentaryMetamorphic

IgneousIgneous means made from fire or heat.When the rock is liquid & inside the earth, it is called magma. Outside the earth it is called lava.Igneous rocks are formed from magma or lava.

IgneousWhen magma cools under the Earths surface it becomes rock!We call rocks that cool INSIDE the Earth INTRUSIVE IGNEOUS ROCK.

IgneousWe call rocks that cool OUTSIDE the Earth EXTRUSIVE IGNEOUS ROCK.

IgneousIntrusive vs. Extrusive Igneous RockIntrusive RocksExtrusive RocksCool SlowlyCool QuicklyForms Big Mineral CrystalsForms VERY tiny Mineral Crystals

IgneousIntrusive RockExtrusive Rock

BIG PINK AND BLACK CRYSTALSNO CRYSTALS, FULL OF HOLES!

IgneousIntrusive RockExtrusive Rock

Large Black CrystalsTINY White Crystals

Igneous

Intrusive or Extrusive?

Igneous

ExtrusiveThere are no visible crystals and the rock is full of holes. This rock must have cooled quickly.

Igneous

Intrusive or Extrusive?

Igneous

IntrusiveThere are very large crystals, which indicate slow cooling

Igneous

Intrusive or Extrusive?

Igneous

Intrusive There are several large crystals. Large crystals are formed when magma cools slowly.

Igneous

Intrusive or Extrusive?Igneous

ExtrusiveThere are no visible crystals and the rock is full of holes. This rock must have cooled quickly.

Igneous

Intrusive or Extrusive?

Igneous

ExtrusiveThere are no visible crystals. This rock must have cooled quickly.

Igneous

Intrusive or Extrusive?

Igneous

IntrusiveThere are very large crystals. This rock must have cooled slowly.

IgneousSample test question:

How are igneous rocks grouped?

A. by the shape and size of the rock sampleB. by how quickly the molten magma cooled C. by the place in the world the sample was found.D. by whether there are layers or bands of crystals