Despite the popular depiction of raindrops as tear-shaped, small raindrops are spherical and larger ones are shaped like a burger bun. Air resistance on the bottom of the raindrop is greater than on its top.
There’s smoke, lightning, thunder and a flash of light zig-zags across the sky every two seconds – this particular kind of lightning is caused by volcanic ash, which is spurted kilometres into the sky during an eruption.
A fast-moving current of gas, rock and ash known as a pyroclastic flow destroys everything its in path on the way down from the summit: in this avalanche-like inferno of ash, temperatures can reach 800 degrees Celsius – enough heat to vaporise 90% of a human body in a flash.
Almost every animal species has evolved over the millions of years in order to better adapt to the changing climate – but the dragonfly is not among them. In evolutionary terms, the construction of its body was already perfect.
Green – at least for the panther chameleon. The reptile is known for its amazing ability to change colour; it can transform its skin in seconds. The change is mostly used as camouflage or to impress the opposite sex.
Their big brains and the complex structure of the cerebral cortex long led zoologists to believe that dolphins must be extremely intelligent. Members of the toothed-whale species can learn movement sequences very quickly.
Crows are extremely empathetic animals and often express their thanks for food by offering small gifts. For the past four years, eight-year-old Gabi Mann from Seattle has been showered with gifts of buttons, stones and screws.
You’d be correct in saying that Africa isn’t really known for snow and ice. But several tropical glaciers do exist on the continent. In the image below you can see a slice of glacier ice on Kilimanjaro in Tanzania – Africa’s highest mountain.