The earth’s surface is constantly being eroded. This means that
rocks are broken up
into smaller pieces by weathering such as wind, water, and ice.
These small pieces of rock turn into pebbles, gravel, sand, and
clay. They tumble
down rivers and streams. These pieces settle in a new place and
begin to pile up and
the sediments form flat layers. Over along period of time, the
pieces become pressed
together and form solid rock called sedimentary rock. Most
sedimentary rocks form
under water.
Most of the earth has been covered by water some time in the past.
70% of the earth is
covered by water now. So sedimentary rocks are common all over the
world.
Sedimentary rocks are often rich in fossils.
Sediments can harden into sedimentary rock in two
ways:-
• Pressure – As layer after layer of sediments are deposited, the
lower layer are
pressed together tightly under the weight of the layers
above.
• Cementing – Some sediments are glued together by minerals
dissolved in water.
Some examples of sedimentary rocks are Limestone, Sandstone,
Conglomerate, and
Shale. Limestone:- Is formed from tiny pieces of shells of
dead sea animals that have
been cemented together. Sandstone:- Is formed from grains
of sand pressed tightly
together. Conglomerate:- Contains sand and rounded peddles
that have also been
cemented together. Shale:- Is formed from mud or clay that
has been pressed together.
Sedimentary rocks are easy to identify because you can actually see
the layers.
Doncaster lies to the east of a massive magnesian limestone out
crop that was formed
in shallow tropical sea at the end of the Permian period, around
250 million years ago.
Limestone has many uses, As a crushed rock it is used to make
concrete, it is a base
material in road construction, and is spread on fields to reduce
levels of acid in soil,
and is used for building.
To get the cache you must do 3
things:-
(1) You most visit the location at the given Co-ords, here you
will find the old
quarry wall. Take a photo of yourself at this location with your
GPS and post
it with log.
(2) E-mail me with the answer to this question what is the
thickness of the biggest
layer of limestone?
(3) E-mail me with 2 more uses for limestone that are not
listed.
Parking layby at entrance on Greenfield Lane has room for 5/6
cars.
 Parking N: 53°30.754
W: 001°09.363 |
FTF Honour's go
to:-
bigdee52.
