The principle that Earth's crust is in floating equilibrium with ...

[amal]

The principle that Earth's crust is in floating equilibrium with the denser mantle below is known as
  ___________________ _. Fill in the blank(s) with the appropriate word(s).

Question 2

Small accreted lithospheric blocks of foreign origin that differ completely from the rocks in
  surrounding regions are called ___________________ _. Fill in the blank(s) with the appropriate word(s).

[dellikani2015]

Answer to Question 1

isostasy

Answer to Question 2

terranes

[amal]

Excellent

[chjcharjto14]

Thanks for the timely response, appreciate it