Rationale: A
sweet potato is equivalent to a serving of bread. One cup of skim or nonfat
milk is a serving of milk. A slice of avocado is equivalent to a serving of
fat. One teaspoon of mayonnaise is equivalent to a serving of fat.
Physical Weathering would be nature related like the wind or rain. Chemical Weathering would be anything caused by a chemical reaction like acids or acidic rain. I think that should help. If not let me know!