The chemicals in the melted rock material determine the color
of the resulting rock.
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Extrusive igneous rock form when melted rock material cools on
Earths surface Form in two ways: - volcanic eruption - fissures on
Earths crust
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Granitic (gra NIH tihk) rock are light color. Extrusive igneous
rocks are often granitic. .
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Intrusive : igneous rock forms when the melted rock material
cools below Earths surface.
Slide 8
Intrusive igneous rocks form when huge glob of magma from
inside Earth is forced upward toward the surface but never reaches
it.
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The magma stays underneath the Earths surfaces cooling for
millions of years. This allows for minerals in the magma to form
crystals. This is why most intrusive igneous rocks have large
crystals.
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Slide 11
Sedimentary rocks: are a type of rock made from pieces of other
rocks, dissolved minerals, or plant and animal matter that collect
to form rock layers. How do you think they form or break apart? -
wind, waves, rivers, etc. & then it is deposited to form
rock
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Examples: Detrital, Chemical, and Organic rocks All these types
of sedimentary rocks can be created from igneous, metamorphic and
even more sedimentary rocks.
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Detrital Rocks: are a type of sediment. made out of grains of
minerals or other rocks that have moved and been deposited in
layers by water, ice, gravity or wind.
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Detrital rocks can be identify by the size of the grains that
make up the rock. Shale, siltstone, sandstone and pebbles are all
different types of Detrital rocks.
Slide 15
Pebbles mixed with other sediment and create a rock called
conglomerates.
Slide 16
Another type of sedimentary rocks are rocks that have formed
from evaporation or other chemical process, these are chemical
rocks.
Slide 17
Chemical sedimentary rocks form when seawater loaded with
dissolved mineral evaporates. Chemical sedimentary rocks also forms
when mineral-rich water from geysers, hot springs, or salty lakes
evaporates. As the water evaporates, layers of the minerals are
left behind.
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Slide 19
A fossil is the remains or trace of a once-living plant,
animal, or microbe. Fossils are type of limestone that is made up
over millions of years from these organisms. Fossils can be found
in all three types of sedimentary rocks detrital, chemical, and
organic.