Ig Rx lesson

Rocks

I.Rock Classification

a._________________________________________________________________________

b.The three rock groups are: ___________________________________________________

Rock Type

Words That Form Them

Igneous

Sedimentary

Metamorphic

Draw

Rocks

Igneous Rocks

Environments of Formation

Crystal Size depends on the amount of time for cooling.

The _ LESS __ time it takes a rock to cool the ___________ the crystals. This is a __________ cooling rate.

The __ MORE__ time it takes a rock to cool the ___________ the crystals. This is a __________ cooling rate.

Extrusive environment

Rate of cooling

General Crystal Size Description

Crystal Size

Texture

Very Fast

None

Non-crystalline

Small (too small to see but sparkles)

Fine

Intrusive environment

Rate of cooling

General Crystal Size Description

Crystal Size

Texture

Large (easy to see)

Coarse

Very Slow

Very Large

Solidifies __________

Solidifies __________

Lava

Magma

(above the ground)

(below the ground)

_______________ (gas pockets)

(noncrystalline)

(less than 1 mm)

(1 mm to 10 mm)

(10 mm or larger)

TEXTURES

1 mm is about thickness of fingernail

10 mm (1 cm) is about thickness of pinky finger

Rocks

Using Scheme for Igneous Rocks Identification (Page _____ of ESRT)

Example 2: Rock containing

Pyroxene and Olivine

crystals less than 1mm with

no gas pockets.

Example 1: Coarse-textured

rock containing Potassium

Feldspar and Quartz.

Rocks