How can clouds help us predict severe storms, the availability of water, and our future climate?

Clouds help us predict severe storms by their appearance. Their are clouds that signify that a thunderstorm, for example, is going to occur. Look for small patches of alto-cumulus clouds, which signify thunderstorms.

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the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.