Grade 6 Science Study Guide: Types of Rocks
Test Date: Wednesday, April 29th
TERM
DEFINITION
Rock
A hard, naturally formed
substance that is made of
minerals
Magma
Molten material beneath or with
in the earth’s crust – igneous
rock is formed from magma
Lava
Rock that is outside the earth
Igneous
Means “made from fire or heat”
they are formed from magma or
lava
Intrusive
Rocks that cool inside the Earth
Extrusive
Rocks that cool outside the Earth
Weathering
The process of rock wearing
down
Erosion
The process of transporting
sediments to a new location
Metamorphic rock
Is formed by heat and pressure.
They are solid rocks that change
when they are heated
Sedimentary rock
Are rocks that are formed from
weathering, erosion,
compaction, and cementation
How are rocks formed?
3 types of rocks
When minerals + fire or heat get
together, rocks are formed
1. Igneous
2. Sedimentary
3. Metamorphic
Igneous rocks are formed..
When molten magma cools and
solidifies with or with out
crystallization
Intrusive rocks examples
Dunite, Granite
Extrusive rocks examples
Basalt, Obsidian
By sediment that is deposited
over time, usually as layers at the
bottom of lakes and oceans.
Sedimentary rocks form…
Types of sedimentary rocks:
Types of metamorphic rock
1. Well sorted
2. Poorly sorted
1. Foliated
2. Non- foliated
Conglomerate rock
is a sedimentary rock consisting
of rounded fragments of a preexisting rocks
How to identify IGNEOUS ROCKS
- Large random crystals
- Holes caused by air bubbles
- Glassy appearance
How to identify SEDIMENTARY
ROCKS
- Well sorted layers
- Poorly sorted rock particles
How to identify METAMORPHIC
ROCKS
- Wavy bands of crystals
- Wavy texture