Some scientists believe the Earth is 4,6 billion years old. However, the mountains, valleys, rivers, deserts and forests we see today are much younger than that.
Xem chi tiếtDo you know the largest fish in the world is a gentle shark with small teeth? It cannot use its teeth to eat. This fish is the whale shark. An adult whale shark averages 25 feet in length. Some reach 40 feet or more.
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