Figure 1 shows a seaside cliff. figure 2 shows the same cliff after a period of time has passed. what caused the change from figure 1 to figure 2?
a. rainfall only
b. ocean waves only
c. wind
d. rainfall and ocean waves

At which point on the diagram do convection currents occur to drive plate movement?

[ou.01jthe greatest speed with which any physical object moves is 300,000 km/soundsec. which of the following has a speed of 300,000 km/sec? a. light in water b. light in vacuum c. sound in air. d. sound in water

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.