In terms of sheer area, oceans are top of the list of the most common landforms. Yes, even oceans are landforms, given that they are composed of vast basins riddled with trenches and mountains.

It’s one of the five oceans that cover nearly three-quarters of the Earth. The Atlantic, Pacific, Indian, Southern and Arctic. Although the water looks calm and still from outer space ...

They produce nearly half the planet’s oxygen too. Lose the oceans and we lose everything. Here are five ways the oceans are ­suffering, with dire impacts for land ­dwellers, that need solutions.