How Rocks and Minerals are Formed
James O., Stephen M., Linsdwy W.,
Michelle S., Rachel K., Stephen S., John V.,
Danielle, Zachary, Matt S., Sarah,
Trent and Vincent
How are rocks and minerals formed
General Discussion. The earth's crust changes and causes new rocks
to form and old rocks to change. This happens when the plates bump
together. A mineral comes from something that was never alive. It can be classified by
a chemical formula. Other minerals were formed from living materials
like animals or vegetables. These minerals are fuels and gasses. Minerals
can become exposed by the natural weathering processes.
Igneous - Igneous Rocks are formed from cooled magma. Magma is melted
rock deep inside the earth. Magma on the crust is called molten lava.
Sedimentary - Sedimentary rocks are formed as sediments are pushed
together or cemented by the weight of the water and layers of sediment above it.
This process of layers settling to the bottom happens over
thousands and thousands of years.
Metamorphic - Metamorphic rocks are made by extreme pressure and/or
heat applied to sedimentary or igneous rocks that changes their
They are both
It gets weathered. Is made from
compacted (pressed down) sediments.
Heat and pressure
change the minerals
which were igneous
Formed from cooled
lava or magma
All are made
heat and pressure
Venn Diagram by Trent and Vincent
Rocks are natural combinations of 1, 2 or more minerals. They
are nonliving solids that are found in nature.
Marble was formed by linestone under great heat. Marble was used
fur statues, and today is used for counter tops and floors. It is used
in bathrooms a lot and it is very old.
Chalk - Formed from the skeletons of time sea animals that are
too small to see with the naked eye.
Limestone was formed by broken shells and tiny sea cretures. It
is solid white color with no other colors. It might look a little chalky.
Diamonds are the hardest known mineral.
Quartzite was formed by sandstone in great pressure and heat. It
was slowly cooled and has a whitish crystal.
Opal comes from the Romans. It is different colors.
Turquois came from the aztecs 3,000 years ago. It is a bluegreen color.
Sandstone was formed by grains of sand settling at the bottom of the ocean
which got pressed together.
Quatz with iron was formed by cooling slowly, but has purplish color
whith white spots, or can be clear, brown or black.
Granite - a rock that you cn find really easily.
Obsidian is black, smooth, and a little sharp.
Pumice is light, white and bumpy
Petrified Wood has reddish or brown color which shows the age stripes.
It often looks like wood.
Tufa - forms when lime is deposited from water into a rock surfact in areas of low rainfall.
Gravel is blueish gray and bumpy.
Coal, also called Black Gold, is millions of years old. We burn it for fuel or heat.
People have been mining coal since the middle ages. It is hard and brittle and black.
Mold - a hollow left in a sediment after an organism dissolves.
Imprint - a trace fossil of an organism, such as a footprint, preserved in rock.
Cast - a fossil formed by sediments filling a mold.
Elementary School with your comments!