Earths tilted axis and its revolution around the sun
The Sun
The seasons or sun i believe... not 100% someone else improve:
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Catalyst?
That is the cause of the seasons.
hot weather
Yes the tilt of the Earth does make the seasons longer and shorter. The sun has something to do with it,too. The farther the Earth is, and how long the rotation is , the hotter and longer the season.
The earth's axis is responsible for the seasons because (for example) we have winter because of the tilt because we are facing away from the sun, in the summer fully towards it, and for spring/autumn we are partially turned towards it.
Seasons are not proven to be abiotic factors, so therefore they are not abiotic factors. But there are abiotic factors during the seasons.
The 2011 seasons are now finished.
The primary factor that determines which substance is most responsible for chemical reactions is the reactivity of the substances involved.
More properly referred to as its orbit. seasons