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types of rocks (igneous rocks (intrusive \plutonic (cooling is not quick,…
types of rocks
igneous rocks
formed by cooling and solidification of magma
are not found in layers , do not contain fosil
intrusive \plutonic
cooling is not quick
small crystals
basalt
Basic
extrusive\ volcanic
cooling is Quick
large crystals
granite
acidic
light coloured
less dense
granite
dark coloured
basalt
Sedimentary rocks
formed from sediment accumulated over long periods
usually found on floors of water bodies
contain fossils & found in strata
organical
accumulation of remains of living organisms
limestone, chalk and coal
chemical
formed by the process of evaporation
rock salt ,gypsum , potash, nitrates, calcite and dolomite
mechanicl
many rocks cemented together
conglomerate, breccia, sandstone , mud stone and shale
LITHOSPHERE
MANTLE
semi solid
iron &magnesium
2,850 km
density= 3.5&5.5
CORE
outer core is liquid
inner core is solid
2900km away
density=5.1& 13
CRUST
is solid
8 to 50 km
thickness
density =2.7 &3
upper part
SIAL
silica + aluminium
lower part
SIMA
Silica+ Aluminium
Has 3 parts
Metamorphic rocks
formed by metamorphism of rocks
due to high temperature and pressure or both
nature texture color completely changes
granite & basalt -gnesis
limestone - marble
shale - slate
coal - graphite - diamond
sandstone- quartz
more silica
less oxide
more oxide
less silica
dense