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The earth is an regular surface in average with a great number of small irregularities (small with respect to the global earth surface).

The geometrical center of earth is obtained by approximating the earth surface with the best fitting rotational ellipsoid, with a circular section corresponding to the equator and a minor axis joining the geographical poles.

The so called "sea level" is defined as the average distance from the geometrical center of earth of all the points on the sea surface.

The altitude of a single earth point is the difference between the distance from the earth center of that point and the conventional sea level.

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What are high altitude clouds made of?

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Altitude adjustments are made for baked goods because of the effects of altitude on how dough and batter rises in baking. There are no altitude adjustments needed for cooking meats.


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Why are high altitude clouds made of ice crystals and low altitude clouds are made of liquid water?

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