Why study rocks?

How rocks are important to every day life

How igneous rocks are formed

Test the density of certain minerals and
rocks given to you to you

Mineral, rock, density, igneous
With your partners discuss these
questions:

State the differences
between rocks and minerals.

Define Density in one
sentence

The mineral I have weighs
200grams and, when placed
in water, displaces 38ml,
what is the Density of my
mineral?
Why study rocks?
Minerals

A chemical substance that is formed
naturally in the ground.

Minerals are considered to be the
building blocks of rocks.
+
Potassium feldspar
quartz
+
+
Sodium feldspar
Gneiss
Three types of rocks
Igneous

Formed from lava cooling quickly
after a volcanic eruption
Sedimentary

Created by sediment of, fossils,
sand, other rocks, layered and
pressed together
Metamorphic

A mixture of both igneous and
sedimentary heated and pressed
together underground
Volcanic rocks
Volcanic rocks:
magma cools – Igneous
Latin:
ig -> Fire
neous -> Born
”FireBorn”
Igneous rocks

Interlocking crystals

Usually no layers

No fossils

Usually dense and hard
Intrusive and
Extrusive
Magma from moves through
Cracks in crust:
-
-
Up through volcano to
surface:_________________
Into pockets of crust: _______________________
Extrusive Igneous Rocks

Cool and solidify quickly:
-
Fine grained
-
Small crystals
E.g:
-
Obsidian
-
Basalt
-
Pumice
Intrusive Igneous Rocks

Cool more slowly
- Larger crystals
- Coarser grain
E.g:
- Granite
- Gabbro

What is the difference between rocks and minerals?

What are the three types of rocks?

Where does an intrusive rock form?

Where does an extrusive rock form?

My rock has large, visible crystals, where might it have
formed?
Students will be selected at random to come up and write
the answers on the board!