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The Rock
Cycle
Sedimentry
here you will learn about sedimentary rocks.Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks)
and is formed in four main ways: by the deposition of the
weathered remains of other rocks (known as 'clastic' sedimentary rocks);
by the accumulation and the consolidation of sediments; by the deposition of the results
of biogenic activity;
and by precipitation from solution.
Sedimentary rocks include common types such as chalk, limestone, sandstone, clay and shale.
Sedimentary rocks cover 75% of the Earth's surface.
Four basic processes are involved in the formation of a clastic
sedimentary rock: weathering (erosion)caused mainly by friction of waves
Igneous
Igneous rocks are formed due to extreme heat and pressure
above and below the eaths crust.
For example if lava were to hit a regular sedimentry rock it would melt the
rock with whatever it melted with too, after this the lava will cool hardening this
stone into what is an igneous rock. Some examples of this are grandite, obsideon, and coal.
Igneous rocks can be made from ontop of the earths crust by lava runing over it or
on a rare occasion a meteor caming at extreme heat.
Also Igneous rocks can be made under earths crust/surface by magma chaimbers
or by heat and pressure due to the earths core.
Example above.
Metamorphic
Metamorphic rocks started out as some other type of rock, but have
been substantially changed from
their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks
are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination
of these factors. Conditions like these are found deep within the Earth or where tectonic plates meet.
Process of Metamorphism:
The process of metamorphism does not melt the rocks,
but instead transforms them into denser, more compact rocks.
New minerals are created either by rearrangement of mineral
components or by reactions with fluids that enter the rocks.
Pressure or temperature can even change previously metamorphosed
rocks into new types. Metamorphic rocks are often squished, smeared out,
and folded. Despite these uncomfortable conditions, metamorphic rocks do
not get hot enough to melt, or they would become igneous rocks!