Download Rock Types PPT

What processes drive the rock cycle?
Where do each of the different rock types form?
Clastic
fragments of other
rocks and minerals.
 The size and shape
of the rock
fragments helps
determine their
names
 Conglomerate,
sandstone and
shale

Organic
 Forms from
organic shells
or skeletal
remains that
cement into
rock.
• fossiliferous
limestone
Chemical
Forms
from
chemicals
dissolved in
water
Limestone
+ Heat and Pressure
=
 Foliated Metamorphic
rocks
that have ribbonlike layers in their
textures.
 Gneiss
(nice)
 Common
in NJ
• Non-foliated
 Marble
• Metamorphic
rocks made of only
one or two
minerals and have
no layering.
 Limestone
+ Heat and
Pressure = Marble
 Obsidian
 Forms
when magma
comes to surface and
cools = extrusive
 Glassy, no crystals
 Volcanic glass
 Granite
 Forms
when magma
cools below the
surface= intrusive
 Scoria
 Volcanic
rock
 Many gas bubbles
What processes drive the rock cycle?
Where do each of the different rock types form?