Differentiate surface current and deep-sea current?​

Which summarizes the relationship between density of an element and its distribution in earth? a. the greater an element’s density, the greater the amount of it found in the crust. b. the denser an elements is, the smaller the amount of it earth core. c. the greater an elements density, the smaller the amount of it’s found in the crust

After world war i, how did the us economy compare to that of germany?

Can you give an explanation of what medc and ledc are.