Which layer will be the youngest in a cross section of land that contains five layers and has no evidence of unconformity? A. the top layer B. there is no way to tell C. the bottom layer D. one of the middle layers

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