How do we know what is inside the Earth? (How do we know the Earth has layers?) (if you put a random answer for the points i will report)

200. ml of 3.00 m nacl solution is diluted to a final volume of 500. ml. what is the molarity of the final solution?

How does the atmosphere to make earth livable? check all that apply. causes the seasons contains oxygen provides warmth creates important nutrients blocks harmful energy from the sun plz like !

What is bromine+calcium iodide--> calcium bromide +iodine balanced