1. the inner core of the is mostly of the earth is mostly made of a. molten iron and nickel b. water c. unknown materials d. solid iron and nickel 2. how does the density of the earth's core compare to the other layers of the earth a. the core is only the less dense than the crust. b. the core is densest layer c. the core is only less dense than the mantle d. the core is the least dense layer. 3. what happens to the temperature as you travel from the surface of the earth to the center a. temperature increases dramatically. b. temperature does not change. c. temperature decreases. d. temperature increases slightly. bee confident and sure to answer. and to get brainliest.