The cracking of rock due to heat is an example of . A. Erosion b. Physical weathering c. Chemical weathering d. None of the above Please select the best answer from the choices provided A B C D.

Can someone list any possible solutions to air pollution ?

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.

Which barrier to economic development is shown in the following examples?