Seasonal changes occur because of
a. earth s tilt.
b. earth s shape.
c. the distance between earth and the moon.
d. the time of year.

Acivilization exists for several hundred yeaars, developing its own language. such a civilization probably has been: a. farming corn b. suffering from a lack of contact with the outside world. c. isolated by mountains or some other physical barriers. d. starving from lack of trade.