Basic General Knowledge
On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that

current of air carry the heat away from the earth on a clear night
on a cloudy night the clouds are warm and therefore retard the cooling
the clear sky allows radiant energy to escape readily from the earth
the clear sky allows the cold of outer space to reach the earth

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Basic General Knowledge
Olympic emblem is composed of five intertwined rings, each of a different colour, representing the five continents of the world as

Blue ring - Asia; Yellow ring - Europe; Black ring - Oceania; Red ring- Africa; Green ring - America
Blue ring - Europe; Yellow ring - Asia; Black ring - Africa; Red ring- America; Green ring - Oceania
Blue ring - Europe; Yellow ring - Asia; Black ring - Africa; Red ring- Oceania; Green ring - America
Blue ring - Asia; Yellow ring - Europe; Black ring - Africa; Red ring- America; Green ring - Oceania

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