Which of the following is an example of a solution? a. flour and water b. sand and water c. salt and water

A solution occurs when the solute and the solvent are distributed evenly, on a consistent ratio. Flour and sand, do not distribute evenly in water, leaving salt as the only possible option.

The image below shows how water and salt form a solution.

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the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers