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Part VIII : Introduction to the Earth

The Earth

Part IX : Climates and Biomes Index

Weather and Climate
Biomes
The Environment : The Atmosphere
The Greenhouse Effect
Is there life on Mars?

Topic Chapters Index

 

Biosphere I

Arial view of the Ural Mountain Range, Russia

 

Biosphere II

Arial view of the river Seine and surrounding fields

 

THE EARTH

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The Hydrosphere, the Lithosphere and the Biosphere

 

Introduction to the Hydrosphere

The North Sea, Filey, UK © Shirley Burchill

The North Sea, Filey, UK

 

Liquid water is essential to life on Earth. The chemical symbol for water is H2O. It can exist as a solid (ice), As a liquid (water) or as a gas (water vapour).

 

Introduction to the Lithosphere

 

Ayre's Rock, Australia © Shirley Burchill

Uluru, Australia

 

Although humans depend on the rocks of the lithosphere to walk on or build on, most of the life forms on Earth do not need solid ground to survive.

 

Introduction to the Biosphere

 

Cattle © Shirley Burchill

Dairy cows feeding, Devon, UK

 

Life has never been observed anywhere else in the universe. Although many scientists agree that there must be some kind of life elsewhere in the universe, there is no evidence to prove that there is.

 

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