At the beach, a student fills two beach pails, one with sand and one with seawater. She places both pails in the same spot in the bright sunlight. After several hours, what will the student MOST LIKELY observe?

it's filtration, but this is an assumption so my apologies if i got this

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.