Because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.
I think the correct answer from the choices listed above is option B. The reactants calcium sulfide and sodium sulfate will react and form a precipitate which is calcium sulfate since it is only slightly soluble in aqueous solution. Hope this answers the question.
Answer: The answer to this question is transpiration.
Explanation: I know this answer because i looked it up in a book. The other explanation is I study about this a lot.
Answer:
A. Solution, Colloid, Suspension
Hope i could help