Earth is the only planet in the Solar System to have water in its three states of matter: as a solid (ice), a liquid (sea, rain, etc.) and as a gas (clouds). Earth is almost five billion years old, although life (resembling life as we know it) has only existed on the planet for the last 150 million to 200 million years. This means that life has only been present on Earth for only 5%-10% of its lifetime.These are all shown below. Water is, of course, the most important liquid for life. Earth and Mercury are the two most dense planets in the Solar System. This means that particles inside the planet are most closely packed together.The length of time it takes for Earth to orbit the Sun is 365 and a quarter days. To make up this extra quarter which isn’t counted at the end of a year, we have an extra day every four years on 29th February. The next Leap Year will be in 2012.
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