Download Rocks: Lesson 3: Thinkinb Map Completed

Chapter 2: Rocks: Section 3: Sedimentary Rock
Name ____________________________________ #_______ date _____________
Rock
Origins of Sedimentary Rock
Composition of Sedimentary Rock
Sedimentary rock-
Three classifications for
sedimentary rock are based on how
the rock is formed.
 This rock is formed when
rock sediments are
transported from one
place to another.
 Eventually these
sediments deposit into
layers.
 Over time they begin to
be compacted and
cemented together.
 Forms at the Earth’s
surface with out heat
and pressure.
 Strata- the layers found
in sedimentary rocks.
1). Clastic Sedimentary Rock- is
made of other fragments of other
rocks and minerals.
2). Chemical Sedimentary Rockforms from solutions of minerals
and water. Limestone is and
example of this type of rock.
Organic Sedimentary Rock
3). Organic Sedimentary RockMost limestone forms from
remains of animals that once
lived in the ocean. This is made
up of calcium carbonate that
animals get from the seawater.
They eventually become
cemented together to form
fossileferous limestone.
Fossils- are the remains or
traces of plants and animals
that have been preserved in
sedimentary rock. Fossils give
us tremendous amounts of
information about ancient life
forms and how they lived.
Most fossils come from animals
that lived in the oceans.
Sedimentary Rock Structures
The most characteristic feature
of sedimentary rock is
stratification, or layering.
Strata differ from one another
depending on the kind, size,
and color of their sediment.
The rate of deposition can also
affect the thickness of the
layers.
Sedimentary rocks sometimes
record the motion of wind and
water waves on lakes, seas,
rivers, and sand dunes.