The continents are one of seven giant landmasses on the Earth's surface, divided by oceans. Geologically, a continent is composed of rocks of lower density than the seafloor or the Earth's mantle.

The planet began with a single land mass in the Mesozoic Era. Plate tectonics and continental drift have changed continental composition over time. To better understand the continents, we must first understand how they were formed. What is the earth made of?

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