How does the chemical composition of these two types of crust contribute the the topography we find at the Earth’s surface today?

Earth has two different types of crust, continental and oceanic, that form the outer chemical layer of the Earth and produce large elevation differences at the Earth’s surface. How does the chemical composition of these two types of crust contribute the the topography we find at the Earth’s surface today?

"Order a Custom Paper on Similar Assignment! No Plagiarism! Enjoy 20% Discount"