List the 6 layers deposited and or eroded

How many time zone are there on earth

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.

In a class of 20 students, what democratic form of governance makes the most sense