an imaginary line that extends through the earths north pole and out the south pole; titled at 23.5

movement in an elliptical path around a center

the cycle of summer, fall, winter, and spring due to variation in intensity of the sun and length of day caused by the tilt of the earth

the cycle of daytime and nighttime

caused by the rotation of the earth about its axis

half of a sphere; the earth is typically divided into the northern and southern hemispheres

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seasons

Term	Definition
axis	an imaginary line that extends through the earths north pole and out the south pole; titled at 23.5
rotation	to spin on an axis
revolution	movement in an elliptical path around a center
season cycle	the cycle of summer, fall, winter, and spring due to variation in intensity of the sun and length of day caused by the tilt of the earth
day/night cycle	the cycle of daytime and nighttime
equator	caused by the rotation of the earth about its axis
hemisphere	half of a sphere; the earth is typically divided into the northern and southern hemispheres