Download Different Types of Rocks and the Rock Cycle

Different Types of Rocks
and the Rock Cycle
Igneous Rocks
• Formed from liquid magma or lava
that cools and solidifies either
after eruption onto the surface or
deep underground.
Igneous Rocks
• Crystal size of rock depends on how
fast it cooled.
• Erupted from a volcano – Cooled
very fast
 human eye can’t see crystals
Igneous Rocks
• Crystal size of rock
depends on how fast it
cooled.
• In a magma chamber
underground – Cooled
slowly
 human eye can see
crystals
Sedimentary
Rocks
• Formed either as fragments of
mineral/fossils that are cemented
together or as minerals that are
precipitated out of water.
Sedimentary
Rocks
• Grain size of rocks depends on
how fast the water was moving.
• If water is moving fast, then it
carries smaller grains
downstream and deposits larger
grains.
Sedimentary
Rocks
• Grain size of rocks depends
on how fast the water was
moving.
• If water is moving slowly,
then it deposits the smaller
grains.
Sedimentary
Rocks
• In oceans, critters create
shells, skeletons, and cell
walls that, when deposited,
form various types of
limestone.
Metamorphic
Rocks
• Formed when pre-existing
rocks are changed into new
rocks because of an
increase in temperature or
pressure as the rocks are
buried.
Metamorphic • At very high T & P (deep within the
Earth), the rocks become color
Rocks
banded. These rocks were formed
deep beneath a mountain.
The Rock Cycle