It does so because the tilt of the earth's axis causes first one pole to slant toward the sun and then the other as the planet orbits the sun.
(It; does; so; because the tilt of the earth's axis causes first one pole to slant toward the sun and then the other) (the planet; orbits; the sun) (the tilt of the earth's axis; causes; first one pole to slant toward the sun and then the other) Context(the tilt of the earth 's axis causes,List([19, 54))):(first one pole; to slant; toward the sun)
the tilt of the earth 's axis causes,List([19, 54))
It the planet the tilt of the earth's axis first one pole
does orbits causes to slant
so because the tilt of the earth's axis causes first one pole to slant toward the sun and then the other
the sun
first one pole to slant toward the sun and then the other
toward the sun