• The tilt of the earth's axis, and the earth's orbit around the sun. Now, to really get a good grade on your homework, you can research WHY these cause the seasons.
  • im no expert but i guess: the earth spins at a slight angle off its centre axis also the earth orbits the sun in 365 days (a year) so in the north half of the globe has summer the south has winter and vice - versa with the possible arrival of global warming melting our icecaps at the poles we will start to see a complete change of seasons i.e. very hot summers, very big storms etc....
  • A clue to the riddle of the comings and goings of the seasons lies in the posture of Earth. Earth does not stand straight up as you do. It is tilted like a tree blown partly over by the wind. In scientific terms Earth's axis is tilted from its orbit around the sun by 23.5 degrees.If it were not tilted, Earth would have no seasons. Its land and water would not warm up in spring and summer, and cool down in fall and winter.
  • The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-cicular path around the sun)

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