6. It is the turning of the earth on its axis.
A. axis B. rotation C. orbit D. equator

7.The earth's___is an imaginary line that goes from the North
Pole to the South Pole.
A.axis B.longitude C.orbit D.equator

8.The portion of the earth facing the sun experiences__while the other half away from the sun experiences__.
A.day,night B.night,day C.night,dawn D.night,day

9.Earth makes a complete revolution around the Sun about once every___.
A.day B.year C.season D.minute North