A look at how without volcanoes, there would be no life on Earth. 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, this episode shows how animals have come up with strategies to survive the uneven amounts of sunlight that fall on our planet.

Weather controls the distribution of freshwater around our planet. In turn, shapes the lives of animals across the globe, rising to an incredible diversity of species and habitats.