axis rotates orbits revolves Easter hemisphere northern hemisphere southern hemisphere hemisphere western hemisphere 1.the________ is an imaginary line where the earth spins. 2.the earth _________on its axis once every 24 hours causing day and night. 3.the earth ________ around the sun once every year. 4. the earth follows a path around the sun known as an_____ 5.A______ is a half of the earth. 6.the earth can be divided into four hemisphere:__________, ________, _______, __________.