Yellowstone is famous for Geysers, the 300 in the park makes up at least 60% of the world's geysers. This easily makes it the largest and most diverse collection in existence. This is one of the hottest places on the planet with heat flows more than 60 times the global average.

As we walked around the boiling hot springs and geysers, we could feel the heat coming fm them in the hot summer day. If you think it all sounds dangerous, it is, there were many signs put up to warn all visitors that the surface around many of the hot springs and geysers are very thin and people have been killed or seriously injured by falling through into the boiling water. We had to make sure we stayed on the designated boardwalk areas and obeyed all the "keep off" signs.

You will notice that the hot springs pictured here are particularly colourful. The colours fm the hot springs in Yellowstone come from algae and bacteria thriving in the heat of the water. They are highly temperature-specific and help create the distinct bands of colours around many of the hot springs. Of particular interest is a bacterium dwelling in the hot spring, from which, an enzyme, Taq, was extracted and ultimately revolutionized molecular biology.

However, above 88C, even these hot water bacteria and algae cannot survive, so the hottest springs appear a deep blue. The deep blue indicates the hottest spot of the spring.



Old Faithful Geyser is easily the most visited geyser in the world. Its not the tallest nor the most frequently erupting geyser in Yellowstone but it provides a great show. This famous geyser erupts once every 92 minutes.



Sawmill Geyser, check out the violent eruptions of boiling water, everyone got wet walking past it.