The physical chemical and biological laws that operate today have also operated in the geologic past. the satemeanr relates to the principle of blank
superposition
cross-cutting relationships
uniformitarianism
correlation

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