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mars has much less gas in its atmosphere than earth does. this is a reason why, on mars,

a. it is warmer
b. there is no wind
c. the air pressure is lower
d. the air pressure is higher

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Someone me with this: a mineral' is determined by its actomic structure.

Which of the following is the earliest era of earth's geologic time scale? cenozoic mesozoic precambrian paleozoic