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MA
NTL
E
CRUST
OUTER
CORE
INNER CORE
he crust covers the mantle and is the earth's hard outer shell,
the surface on which we are living. Compared to the other
layers the crust is much thinner. It floats upon the softer,
denser mantle. The crust is made up of solid material but this
material is not the same everywhere. There is an Oceanic
crust and a Continental crust. The first one is about 4-7 miles
(6-11 km) thick and mainly consists of heavy rocks, like
basalt. The Continental crust is thicker than the Oceanic
crust, about 19 miles(30 km) thick. It is mainly made up of
light material like granite.
T
The inner core of the Earth, its innermost hottest part as detected by
seismological studies, is a primarily solid sphere about 1,216 km
(760 mi) in radius, or about 70% that of the Moon. It is believed to
consist of an iron-nickel alloy, and may have a temperature similar to
the Sun's surface, approximately 5778 K (5505 °C).[1]
The outer core of the Earth is a liquid
layer about 2,266 kilometers thick
composed of iron and nickel which
lies above the Earth's solid inner core
and below its mantle. Its outer
boundary lies 2,890 km (1,800 mi)
beneath the Earth's surface. The
transition between the inner core and
outer core is located approximately
5,150 km beneath the Earth's surface.
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The mantle is a part of a terrestrial planet or other
rocky body large enough to have differentiation by
density. The interior of the Earth, similar to the other
terrestrial planets, is chemically divided into layers.
The mantle is a highly viscous layer between the
crust and the outer core. Earth's mantle is a rocky
shell about 2,890 km (1,800 mi) thick[1] that
constitutes about 84 percent of Earth's volume