Naturally happening phenomenon that puzzles even scientists.

1)Earthquake Light

Earthquake Light is a very rare phenomena that occurs just before an earthquake takes place. It is an unusual luminous air phenomena.The research on the causes behind this process is going on. A number of theories has been proposed to explain this phenomena like: piezoelectricity,ionization of atmosphere or magnetic field of earth.None of these theories have yet provided a conclusive evidence to this phenomena.

2)Sailing Stones of Racetrack Palaya

The sailing stones are a geological phenomenon found in the Racetrack. Slabs of dolomite and syenite ranging from a few hundred grams to hundreds of kilograms slide across the Playa surface, without human or animal intervention. The tracks have been observed and studied since the early 1900s, yet no one has seen the stones in motion. Racetrack stones only move once every two or three years and most tracks last for three or four years. Stones with rough bottoms leave straight striated tracks while those with smooth bottoms wander.A number of theories keep on emerging to expalin this phenomena but it continues to puzzle scientists.

3)Naga Fireballs or Mekong Lights

The Naga fireballs also known as the Mekong lights, and “bung fai paya nak” by the locals, is a phenomenon often seen in Thailand’s Mekong river —in which glowing balls are seen to be  naturally rising from the water high into the air.

 The balls are reddish and have diverse sizes from smaller sparkles up to the size of basketballs. They quickly rise up to a couple of hundred metres before disappearing. The number of fireballs reported varies between tens and thousands per night

4)Electric Blue Seas

It may look like an alien life-form has washed up on a beach, but this striking neon blue effect is a completely natural phenomenon.
The incredible image above was taken by photographer Doug Perrine during a visit to Vaadhoo, one of the Raa Atoll islands in the Maldives.
It captures a natural chemical reaction called bio luminescence, which occurs when a micro-organism in the water is disturbed by oxygen

Although a rare sight on a shoreline, the phenomenon is more commonly seen at sea in the wake of ships that stir up the oxygen in the sea, which causes the bio luminescent bacteria to glow.

Source:
Earthquake light
Sailing stones
Naga fireball
Glow with the flow: Natural phenomenon turns sea water an electric neon blue as it washes up on beach

https://www.quora.com/What-are-some-of-the-things-found-in-nature-that-still-puzzle-scientists/answer/Sunny-Mishra-9?share=d9e99252&srid=ndBp