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so what is a rock they're very tiny grains of different minerals compress
together in chemical reactions to form a larger mass
Rocks make up the non water part of the Earth's crust become an infinite sizes
shapes colors weights textures and strengths Rocks constantly changed from
one type to another and from place to place in a cycle known as the rock cycle
this change does not occur in short periods they take thousands to millions
of years to change routes may be hard or soft it depends on the way the tiny
grains interlock with each other Rocks with rough grain spinning perfectly into each
other tend to leave no room for moisture as a result they are harder and
non-porous and major let's start with metamorphic rocks they start out the
same as any other type of rock that are substantially changed from their
original igneous sedimentary or earlier metamorphic form metamorphic rocks
formed when rocks is subjected to high heat pressure hot mineral rich fluids or
more commonly combination of these factors slate for example is a
fine-grained foliated metamorphic rock that is created by the alteration of
shale or mud stone by metamorphism because of its great tensile strength
and durability this make slate a highly athletic rock with the correct speed and
angle so you can skip across water with the grace of a gymnast the process of
metamorphism does not melt the rocks but instead transforms them into denser more
compact rocks pressure or temperature can even change previously metamorphic
rocks into new types
sedimentary mocks make up 75 percent of the Earth's surface yet here we observe
their formation underground this water contains dissolved calcite as the water
evaporates or loses
and here we see some stalactites stalactites and stalagmites are
elongated forms of various minerals deposited from solution by slowly
dripping water a stalactite hangs like an icicle from the ceiling or sides of a
cavern a stalagmite appears like an inverted stalactite rising from the
floor for cavern reaching down from the cavern ceiling stalactites are among the
most artistic rock formations but these two lactates are not just a pretty face
they have a passion for music igneous rocks formid magma from inside the earth
moves towards the surface or is forced to of the earth surface of lava and ash
by volcano here cools and crystallizes into rock igneous rocks are divided into
two groups intrusive and were extrusive depending on where the molten rock
solidifies intrusive forms when magma is trapped deep inside the earth extrusive
or volcanic igneous rock is produced when magma exits and cools above the
Earth's surface another athlete pumice is an example of
an extrusive formation the unusual foamy configuration of pumice happens because
of a simultaneous rapid cooling and rapid depressurization pumice is a very
plentiful amorphous rock found all over the planet especially in around water
where it loves to swim
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