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Most of the earth's surface (70%) is covered with water, and the remaining 30% are the seven continental landmasses. The earth's outer layer formed a hard crust as the surface cooled 4.5 billion years ago. The crust consists of large plates that slowly moves relative to each other. Mountain ranges may be forced up if two plates collide into each other. In addition, many other surface features are the result of the drifting plates. The plates move about one inch per year, so millions of years ago the continents were in a different position. About 250 million years ago, most of the land was connected together, and over time has separated into seven continents.
Click here to see what the surface looked like 250 million years ago
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