Transcript Sediments stick together

Sediments stick together
Sedimentary rock
What is it?
Sedimentary rock is accumulated
sediment that has been compacted, or
pushed together, or cemented together.
Sedimentary rock comes in three
families – clastic, checmical, and
organic.
Silt, clay, and sand are the most
common sediments on the planet.
Clastic sedimentary rock
Rock that are cemented
together by watercarried minerals are
called conglomerates.
Sandstone is a common
example of a clastic
rock.
Shale is another
example – it is layered
clay fragments
cemented together into
layers.
Chemical sedimentary rock
Minerals once dissolved
in water that stick with
sediments are in the
chemical family.
Gypsum and halite are
common examples.
The Bonneville Salt
Flats in Utah contain
many evaporite
deposits.
Organic sedimentary rock
Organic rock is formed
from living things.
Marine organisms like
clams and oysters have
shells made of
limestone.
Chalk is the remains of
marine single-cell
organisms.
The chalk used on the
blackboard is actually
Gypsum.
Other interesting features
Stratification is layering of
rock in different sizes.
Ripple marks are evidence of
changes by wind and water
preserved on rock.
Mud cracks result from
muddy deposits that harden
and shrink.
Fossils are sometimes neatly
preserved in sedimentary
rocks.