Transcript “The Rocks of the World Go Round and Round” (sung to the song

Rock
Cycle
“The Rocks
of the World
Go Round
and Round”
(sung to the song “wheels go round”)
I. Three Types of Rocks
• Igneous Rocks
• Sedimentary
Rocks
• Metamorphic
Rocks
A. Igneous Rocks
• Formed from
molten rock
• Most abundant
rocks
• Molten rock
below the
surface is called
magma
Common Igneous Rocks:
Granite
Obsidian
Basalt
Pumice
Intrusive or Extrusive?
• Intrusive—cools
• Extrusive—cools
slowly below the
quickly on the
surface—large mineral
surface—small mineral
grains (granite)
grains (obsidian)
Igneous rocks can form at hot
spots, divergent plate boundaries
and convergent plate boundaries
B. Sedimentary Rocks
• Physical weathering
breaks rocks into
small pieces which
are pressed together
• Chemical weathering
dissolves materials
into a water solution
which evaporates
Common Sedimentary Rocks
Coal
Sandstone
Limestone
Halite (Rock Salt)
Fossiliferous Limestone
Formed different ways
• Clastic - Made from broken fragments (ex:
sandstone, breccia)
• Chemical - Precipitated from solution (ex:
limestone, rock salt)
• Organic - Formed from living things (ex: coal,
fossil limestone)
C. Metamorphic Rocks
• Rocks change
due to
temperature
and pressure
(do not
completely
melt)
Common Metamorphic Rocks
granite
gneiss
shale
slate
sandstone quartzite
Foliated or Non-foliated?
• Foliated—grains
line up in parallel
stripes
Gneiss
• Non-foliated—
grains change but
don’t form bands
Marble
II. Rock Cycle
• The rock
cycle is not
a one-way
cycle.
• It can go in
many
directions.
Rock Jokes
• What is a rock’s favorite cereal?
• What is a rock’s favorite
transportation?
• What is a rock’s favorite music?
• How do rocks wash their clothes?