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Title: Rock Cycle of the Earth
Description: The rock cycle is a model that describes the formation, breakdown, and reformation of a rock as a result of sedimentary, igneous, and metamorphic processes. All rocks are made up of minerals.
Description: The rock cycle is a model that describes the formation, breakdown, and reformation of a rock as a result of sedimentary, igneous, and metamorphic processes. All rocks are made up of minerals.
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THE ROCK CYCLE
Earth, being a terrestrial planet, is composed of rocks and minerals as part of the
geosphere
...
The lithosphere extends to a depth of about 100 kilometers down the surface containing
different rocks and minerals from both the continents and the oceans
...
Just as minerals are the building blocks of rocks, rocks are
the natural building blocks of Earth's lithosphere
...
Rocks are constantly being transformed, generated, and destroyed in a process
called rock cycle
...
igneous,
2
...
metamorphic
Igneous rocks are formed through the cooling of magma or lava
...
*** Magma or lava may be solidified in one of three ways:
1
...
On the surface, from fast-cooling lava - rocks formed have no visible crystals (finegrained), may become volcanic rocks or extrusive igneous, such as basalt and andesite
3
...
Sedimentary rocks accumulate on Earth's surface in a process called deposition
...
The process by which these
unconsolidated materials become solidified into rock is called lithification
...
Other
sedimentary rocks, such as plutonic igneous rocks, are lithified below the surface when
they are buried under layers of sediment
...
Metamorphic rocks are formed from the exposure of sedimentary or igneous rocks to
high pressure
...
Prior to metamorphism, the original rock
which can either be igneous rock, sedimentary rock, or a metamorphose, is referred to
as the protolith
...
Classifications of Rocks
Classifying rocks is usually based on their texture and composition
...
Because igneous, sedimentary, and metamorphic processes are distinct, their textures
are also distinct
...
Generally, aphanitic rocks have grains that are too small to see or identify, while
phaneritic rocks have grains, which are big enough to see
...
If the grain size is larger than 1/16 mm, the rock is phaneritic
...
In sedimentary rocks, the difference
between aphanitic and phaneritic is set at 1/256 mm
...
Title: Rock Cycle of the Earth
Description: The rock cycle is a model that describes the formation, breakdown, and reformation of a rock as a result of sedimentary, igneous, and metamorphic processes. All rocks are made up of minerals.
Description: The rock cycle is a model that describes the formation, breakdown, and reformation of a rock as a result of sedimentary, igneous, and metamorphic processes. All rocks are made up of minerals.