Steps of the scientific method. I don’t understand!!!

Why is earth's outer core hotter than earth’s oceanic crust? earth’s oceanic crust is denser than earth’s outer core is. earth’s oceanic crust has lava flowing from the mantle. earth’s outer core has a composition of solid iron and nickel. earth’s outer core is deeper within earth than oceanic crust is.

Which of these is not a nucleotide base found in dna?

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil