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For lightning to form there has to be a rising current of air within the cloud, carrying ice crystals and water droplets upwards. The droplets become hail, and start to fall as the air becomes thinner, rubbing some electrons off the minute ice crystals, which continue to rise, now positively charged. The soft hail falls to lower levels and is now negatively ...


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The definition of temperate rainforest is rather vague and varies around the world, but in general they are forests well away from the tropics which have a mild, damp climate, and prolific rainfall. Trees can be coniferous, evergreen broadleaf or deciduous broadleaf. Welsh rainforest (I prefer to call it woodland) is mainly deciduous oak, and rather bleak in ...


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