From a ship, the ocean looks smooth. Under the water the ground is wildly bumpy. The ocean floor has tall mountain ranges, deep valleys, underwater volcanoes, and huge flat stretches called abyssal plains. If you drained the seas, you would see a landscape as dramatic as any continent. Most of it stays hidden under kilometres of water.
⚡ DID YOU KNOW?
More than two-thirds of Earth's solid surface is ocean floor. Learning its shapes helps us understand how the whole planet works.