Answer:
Oceanic crust is thinner and more dense than continental crust. Continental crust is thicker and less dense than oceanic crust. These differences in thickness and density are due to the way in which the crust forms and the materials it is made of.
Oceanic crust is formed at the ocean floor through the process of seafloor spreading, where molten rock (magma) rises up from the mantle and cools to form new crust. Because this process occurs at great depths, the pressure is high and the magma is able to cool quickly, forming a dense, thin layer of crust. Oceanic crust is composed primarily of basalt, a type of rock that is rich in iron and magnesium and relatively low in silica.
On the other hand, continental crust is formed through the process of plate tectonics, where plates of the Earth's crust collide and merge. This process occurs at much shallower depths than seafloor spreading, and the magma cools more slowly, forming a thicker, less dense layer of crust. Continental crust is composed of a variety of rock types, including granite, which is rich in silica and relatively low in iron and magnesium.
Overall, the differences in thickness and density between continental and oceanic crust are due to the way in which the crust is formed and the composition of the rocks that make up the crust.