Multiple choice Which of the following statements is correct? The outer core is in a solid state while the inner core is in a liquid state. The core is made up of very heavy material mostly constituted by nickel and iron. The centre of the earth is at 5,300 km. Both 1, 2 and 3 are all correct. Both 1, 2 and 3 are all incorrect. Reveal answer Fill a bubble to check yourself B Correct answer Explanation This statement is correct.