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About the Earth
The Earth is the largest of the inner planets. It has a dense iron-nickel core surrounded by layers of silicate rock. Earth's surface is approximately three eights ( 3/8 ) land and five eights ( 5/8 ) water, and the lower atmosphere consists of a mixture of nitrogen, oxygen and other gases supplemented by water vapour. With this atmosphere and surface, temperatures usually vary between minus fifty degrees Celcius (-50 °C) and plus forty degrees Celcius (+40 °C), life is possible.
 © Copyright 2002, 2003 Seelendran Naidoo All rights reserved.
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