3.
Earth’s interior is divided into
layers: the crust, mantle, &
core, based on composition.
Although the Earth’s crust
seem stable, the extreme heat
of the Earth’s interior causes
changes that slowly reshape
the surface.
Earth’s Interior
4.
5. Outermost layer of earth made of rock that forms earth’s outer
skin
5 to 40 km thick
It is brittle in nature.
thinnest layer
Nearly 1%of the earth’s volume and 0.5%of earth’s mass
are made of the Major constituent elements of crust are
Silica (Si) and Aluminium (Al) and thus, it is often termed
as SIAL.
The Crust is divided into two parts-
Continental & Oceanic Crust
The CrustThe Crust
6.
CRUST
Continental Crust
crust that forms the
continents
consist mainly of less
dense rock (granite -
lighter in color)
30 to 50km average
thickness
Oceanic Crust
crust beneath the
oceans
consist mainly of dense
rock (basalt - dark in
color)
5-10 km thick
7. The upper part of the mantle and the crust together
form a rigid layer called the lithosphere.
Lithos is greek for stone, 100 km thick made of
pieces called tectonic plates.
Crust to Mantle
8.
The tectonic plates are pieces of the lithosphere that
fit like pieces of a jigsaw puzzle and move on top of
the asthenosphere
May Consist of both Continental and Oceanic Crust
Tectonic Plates
10.
layer of rock between crust and core.
The mantle is the largest layer of the Earth
The mantle is about 2900kms in thickness
Nearly 84% of the earth’s volume and 67% of the
earth’s mass is occupied by the mantle.
Composition - silicon, oxygen, iron and magnesium
physical conditions in mantle change because pressure
and temperature increase with depth temp ranges from 870
ºC to 2,200ºC
The Mantle
11.
Innermost layer of the Earth
6800 km in diameter (3,400 km from outside edge of
core to center of core)
It is composed mainly of iron (Fe) and nickel (Ni) and
hence it is also called as NIFE.
The core constitutes nearly 15% of earth’s volume and
32.5% of earth’s mass.
Temperature ranges from 2,000 ºC to 5,000ºC
Consist of 2 parts; Inner Core and Outer Core
The Core
12. layer of molten metal (iron
and nickel) beneath the
mantle
The outer core is liquid or
semi liquide.
The outer core is made up
of iron and is very dense.
surrounds the inner core
2,200 km thick
The Outer Core
13.
dense ball of solid metal (iron and nickel)
extreme pressure from layers above
1200 km, from outside edge of inner core to center
The inner core is solid
The Inner Core
