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

Afarmer who is grown corn for the past five years notices in the sixth year that the his harvest is significantly smaller, despite an increase in labor on the farm. the following year, the harvest continue to decline. which of the following explanations most plausibly accounts for the reduction in corn yield? a) soil degradation b) desalinization c) better irrigationd) terracing