Download earth`s layers - Net Start Class

Earth’s layers
core, mantle, crust
CORE
Core
center of earth; divided into outer core and
inner core
INNER CORE
Inner core
solid and innermost layer
● made of solid iron and nickel
● temperatures up to 5,000 C
● greatest amount of pressure of all layers
● believed to be responsible for earth’s
magnetic field
● depth = 5150 km
OUTER CORE
Outer core
surrounds inner core
● 2nd layer of the core
● depth = 2,900 km
● thickness = 22,500 km
● made of liquid iron and nickel
● temperatures = 2,200 C in upper part
to almost 5,000 C near inner core
MANTLE
Mantle
second layer of the earth
● thickest of all layers
● temperature and pressure increase with
depth; 870 C in upper mantle to 2200 C
in lower mantle
Plasticity
property which allows solid rock to flow
slowly; mantle has this property
CRUST
Crust
thin, outermost layer of earth (3rd layer)
● all life exists on or within a few hundred meters
above crust
● made of 3 types of solid rock:
igneous rock, metamorphic rock, sedimentary rock
2 types
continental crust – under continents (thicker)
oceanic crust – under oceans (thinner)
BY TEMPERATURE
COOLEST TO HOTTEST:
CRUST → MANTLE → OUTER CORE → INNER CORE
BY THICKNESS
THINNEST TO THICKEST:
CRUST → INNER CORE → OUTER CORE → MANTLE
LITHOSPHERE
Lithosphere:
solid, topmost part of the earth; 50 – 100 km thick and
broken up into large sections called lithospheric plates;
there are at least 7 major plates
ASTHENOSPHERE
Asthenosphere:
the layer directly beneath the
lithosphere; the upper edge of
the mantle; Made of hot molten
material, which has the property
of plasticity;
● lithospheric plates move on
the hot molten material that
forms the asthenosphere