what does crust mean in science
crust. The solid, outermost layer of the Earth. â¦ The crust that lies underneath the continents is called continental crust, and is approximately 22 to 37 miles (35.4 to 59.6 kilometers) thick.It consists mostly of rocks rich in silica and aluminum, with minor amounts of iron, magnesium, calcium, sodium, and potassium.rust-form a crust or form into a crust; The bread crusted in the oven. change surface-undergo or cause to undergo a change in the surface.