The tilt of the earth's axis of about 23 degrees gives us the seasons, as the solar radiation favors the northern hemisphere in the time span between March 21st and September 21st and the southern hemisphere during the other six months.
(The tilt of the earth's axis of about 23 degrees; gives; us; the seasons) (the solar radiation; favors; the northern hemisphere)
The tilt of the earth's axis of about 23 degrees the solar radiation
gives favors
us the seasons
the northern hemisphere