Download What are Rocks?

What are Rocks?
Cornell Notes pg. 129
What is a Rock?
• Naturally Occurring
• Solid
• Mixture of one or more
minerals
• May contain organic
matter
Discuss…
1. How are Rocks and Minerals similar?
2. How are they different?
Classifying
Rocks
• Rocks are divided into
three main categories
based on how they
were formed
– Igneous
– Sedimentary
– Metamorphic
Classifying
Rocks
• By composition- the
minerals a rock contains.
– Granite=
quartz + biotite + feldspar
– Limestone= calcite + argonite
• By texture- the size, shape,
and positions of the grains.
Think…
• Do rocks always stay the same?
How do rocks
change?
• Weathering- rocks are
broken down into
smaller rocks and sand,
(sediment)
• Erosion- sediment is
removed from its
source.
• Deposition- area
where sediment comes
to a rest.
• Heat and Pressurecan morph the rock or
even cause the rock to
melt and form magma.
What is the
Rock Cycle?
• Continual process by
which new rock forms
from old rock
• Rock may be changed
from one type to
another
– Rock is Recycled!