The Core of the earth is made up of…
A. Mainly of iron in the liquid form
B. Mainly of nickel in the liquid form
C. Both iron and silica in the liquid form
D. Both iron and magnesium in the plastic state
Future Perfect TenseSpellingPast Perfect Tense
How to use : Read the question carefully, then select one of the answers button.
Tips : If this page always shows the same questions, make sure you correct the question first by pressing the "check answer" button.