Crust describes the outermost shell of a terrestrial planet. Earth’s crust is relatively thin, just 40-kilometers (25-miles) deep. Earth's crust can be divided into two types: continental and oceanic. How do these two types of crust differ? All BUT ONE could apply. A) Continental crust thicker than oceanic crust. B) Continental crust is less dense than oceanic crust. C) Continental crust granitic composition: oceanic crust basalt and gabbro. D) Continental crust enriched with Fe and Mg: oceanic enriched with Al and Si.