Will mark ! !

the materials below the crust:

are less dense and softer
are more dense but softer
are lighter in weight
more compact but harder

the Answer to the question is (drum roll) A!!

you probably know the answer. stop asking stupid questions and making me waste my time. j.k. ; )   b.t.w. what are three ratios equivalent to 5 : 11? thx

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )