Diapositiva 1

1
UNIT6
The Earths structure
REVISING THE EARTHS SPHERES
Natural Science 2. Secondary Education
2
UNIT6
Revising the Earths spheres
The Earths spheres

• The Earth is divided into four distinct spheres

The biosphere
The atmosphere
The geosphere
The hydrosphere
Click on each sphere to find out more
Natural Science 2. Secondary Education
3
UNIT6
Revising the Earths spheres
The biosphere

• The biosphere is made up of the planets living
  organisms.

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Natural Science 2. Secondary Education
4
UNIT6
Revising the Earths spheres
The atmosphere

• The atmosphere is made up of the gases that
  surround the planet.

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Natural Science 2. Secondary Education
5
UNIT6
Revising the Earths spheres
The hydrosphere

• The hydrosphere is made up of all of the water
  found on the planet.

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Natural Science 2. Secondary Education
6
Revising the Earths spheres
UNIT6
The geosphere

• Of all the Earths spheres, the geosphere
  occupies the greatest volume. It is almost
  perfectly sphere-shaped.
• It is divided into a number of layers

Crust This is the thinnest layer of the
geosphere. The hydrosphere, the biosphere and the
atmosphere are located on this layer.
Mantle The thickest layer, the mantle is made of
malleable rocks and some molten materials.
Core This is the innermost and hottest layer of
the geosphere. It consists of the outer core,
which is molten, and the inner core, which is
solid.
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Natural Science 2. Secondary Education