A look at how there would be no life on Earth without volcanoes. Although destructive, magma from the planet's molten core builds land, and mineral-rich ash from eruptions fertilises the surface.

From the frozen poles to the searing deserts, an exploration of how animals have come up with strategies to survive the uneven amounts of sunlight that fall on Earth.

A look at how the planet's limited fresh water is distributed around the globe due to storms, and how animals manage in the driest habitats on Earth.

There are not five separate oceans, but one. Its waters linked by powerful forces that keep them on the move.

Humans are changing the planet so rapidly, it's affecting Earth's life support systems: the weather, the oceans, and the living world.