An oil skimmer is a machine used to separate a mixture of oil and water. after an oil spill in a body of water, skimmers are used to remove the floating oil from the water. which property is being used to separate oil and water in this way?

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