This occurs when dead organic matter sinks to the bottom of a water body and it rots. Due to this, methane is released. If the water freezes, it traps the methane bubbles.
On first sight this is often mistaken for frozen jellyfish. This can be seen at Lake Abraham in Canada. Though harmless, if lit on fire these bubbles can explode.
Image Source: earthtripper.com
Found specifically in the Kawah Ijen volcano in Indonesia, the lava is not the typical red colour but neon blue. The lava from this volcano contains large amounts of pure sulphur that glows with an icy blue colour at night.
This being a very rare and spectacular sight, the locals have begun to take the blue lava and sell it.
Image Source: cdn.zmescience.com
The famous Colombian river which is located in the Serrania de la Macarena province of Meta is also known as the ‘River of Five Colours'. It is regarded as the most beautiful river in the world as the water is crystal clear all year round.
During what is called the dip season when the water level falls, the moss underwater is exposed to the sunlight that gives this vast array of colours. The river looks like a liquid rainbow.
Image Source: simplepimple.com