Transcript PowerPoint for rocks and rock cycle

Rocks and rock cycle
A rock is a NATURALLY OCCURRING, COHERENT (i.e. not
a pile of loose materials) SOLID material,
consisting of:
a. ONE OR MORE MINERALS, or,
b. GLASS (e.g. obsidian), or,
c. ORGANIC MATTER (e.g. coal)
Metamorphic rocks
Erodes
Becomes
That weathers
Deposits
and lithifies,
Exposed to:
• Increased pressure
• High heat
• Hot fluid
Any existing rock
Becomes
That melts
Becomes magma
Which cools
to make
Igneous rocks
Sedimentary rocks
Igneous
rocks
Sedimentary
rocks
Metamorphic
rocks
Form when magma
becomes solid
Form either by cementing broken
pieces of pre-existing rocks together
(e.g. sandstone), or,
by precipitation of minerals out of
water solution (e.g. limestone)
Form when pre-existing rocks are
altered by heat and/or pressure
and/or hot fluids into new rocks
without becoming anything else in
between.