How is the core, mantle. plate tectonics, and convection currents related?

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Explain how fossils scientists make discoveries about the lives of organisms and about how environments have changed over time. plz hurry up it time

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what