Transcript The core

UNIT
6
The Earth’s structure
THE LAYERS OF THE GEOSPHERE
Natural Science 2. Secondary Education
UNIT
6
The layers of the geosphere
Crust
Mantle
Core
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Natural Science 2. Secondary Education
UNIT
6
The layers of the geosphere
The crust
• This is the outer layer of the geosphere.
• It is very thin compared with the mantle and
core.
• It is made up of hard, solid rocks.
• There are two zones:
The oceanic crust: this is
found on the ocean floor. It is
thinner and denser than the
continental crust.
Natural Science 2. Secondary Education
The continental crust: this
forms the continents and the
continental platforms.
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UNIT
6
The layers of the geosphere
The mantle
• This is the middle layer of the
geosphere; it is also the thickest.
Hard
mantle
Soft
mantle
Mantle
Natural Science 2. Secondary Education
• It is made up of denser rocks than
those of the crust. Most of them are
solid.
• The rocks in the upper part are hard,
but most of the rocks of the mantle are
relatively soft (malleable), and in some
zones they can be molten.
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UNIT
6
The layers of the geosphere
The core
• This is the innermost layer of the Earth. It
is also the densest.
• It is made up of metals.
• There are two parts:
• The outer core, which is molten
metal.
• The inner core, which is solid.
Outer
core
Inner
core
Core
Natural Science 2. Secondary Education
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