Hypothetical geography questions?

Question

discuss the possible effects each of the following could have on the amount of insolation recieved on the earth's surface, and on the heating of the earth's atmosphere if;

a) The earth did not rotate on its axis but did continue revolving around the sun

b) The density of the atmosphere decreased significantly

c) The earth's rotation is twice as fast as present

Answer 1

a) If Earth doesn't rotate with respect to the stars then the day would last the length of a year. Insolation will be so much that much of the water would evaporarate. The oppressive humidity though clouding the sun as seen from ground, will result in greenhouse effect of extreme order (two to three hundred degrees).

On the other hand if Sun never sets on one side, facing him all the time. This side will result in evaporated seas and excessively high humidity and temparatures. The night side will be permanently snowclad and receive warm winds at the twilight zones of the geography melting the snows and the water flowing towards dayside where they turn to steam again. There would be snow movement in gigantic glaciers towards periphery of night time area.

b)If atmospheric density is less there will be heavy breathing and chest (lungs) fills up much larger part of torso. There won't be anu human or animal habitation (except some adapted species) beyond 3km height. Water boils at a much less temparature.

c) Day will be 6hrs & night will be 6hrs. There will not be a 'week' (which is an artificial measure of time anyway) but 'fortnight' of work. Tides and winds will be stronger. Human metabolic rate will adapt to this doubling of speed. There may not be any 'afternoon siesta'.