49K views · 694 reactions | Volcanoes are as dangerous as they are majestic. Over 50 eruptions rock our planet every year. This video helps you understand what causes volcanoes to form and erupt—and shows where they are most likely to be found. | National Geographic TV | Facebook

Portals into the machinations of the Earth, volcanoes take many forms – and occur due to a range of underlying processes. Take a look at these spectacular examples to understand a little about their destructive power – and the reason why | National Geographic UK

One of nature's amazing phenomenons is watching a flock of hundreds, or even sometimes thousands, of Vaux's swifts enter a chimney overnight to roost. They will find a suitable roost on their migration journey from Central and South America up to Northern BC and Alaska. Similar to the Chimney Swift, they are a slightly smaller bird, with a thick "cigar" shaped body, short tail, and long, angled wings. These aerial insectivores catch insects in the air, using fast aerial stunts. If you want to le