The oceans, which cover 70 percent of the planet, are an unknown world to us. The Pacific Ocean is the largest one.
The lowest point on the Earth is also there. It is called Challenger Deep and it was discovered in 1875.
Without the energy from the Sun, the Earth would have no life at all. Nowadays everyone knows that the Sun is a star. Like all stars, the Sun is a great burning ball of gases.
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