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Reply	Lee E - Leeds, yorkshire says: Possibly due to Ozone produced in a lightning storm? Ozone is used to kill bacterial matter in water/disinfect water. Lightning produces quantities of Ozone, and this can sometimes be smelt in the air after a thunderstorm.  (no votes) Tags: technology, unanswered, transport, planet earth, plants.
	posted on 2007-08-07 12:41:00 | Report abuse

Reply	Anonymous says: well if you have lots of O2 (which is 2 oxyegn bonds) then some will split and add on to other O2's to make O3 (ozone), you then add it to water and t splits into O and O2again. Thats how it cleans the water.Im only 14 by the way :D  (no votes) Tags: technology, unanswered, transport, planet earth, plants.
	posted on 2008-02-04 21:25:00 | Report abuse

Reply	Michael Marshall says: This answer was selected and edited by New Scientist staffElectrical storms are generally associated with heavy rain - this is where the answer lies. The additional rain adds water to the pond, giving a smaller ratio of algae to the amount of water. This will make it appear as if there is less algae, even though the absolute amount of algae is probably constant.Drinking water, too, commonly contains organic matter when it hasn't rained for a long time. Following a heavy rainfall there is a higher volume of water, so the ratio of algae to water would also decrease in this case.Dan Bikos, Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, UK  (1 vote) average rating:4 Tags: technology, unanswered, transport, planet earth, plants.
	posted on 2009-04-09 12:48:00 | Report abuse

Reply	Hannah says: When there is heavyrain, the water in the fish pond will over-flow. When something over-flows with clean water, it lowers the ratio of dirty water in the pond, the clean water dilutes the murky water. Therefore, if there was heavy rain, then the water will appear 'Crystal clear'. However, the alge will not be effected by this. That would come down to the fact that because you can see it clearly, it lookes cleaner, and your brain suggests that there is less of it.  (no votes) Tags: technology, unanswered, transport, planet earth, plants.
	posted on 2009-04-09 21:21:00 | Report abuse

Reply	Calum Cashley says: Algae is frightened by lightning and hides for a while - honest.  (no votes) Tags: technology, unanswered, transport, planet earth, plants.
	posted on 2009-04-15 02:07:00 | Report abuse

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