Question

what are earths three main layers?
a core, mantle, and surface
b core, mantle, and crust
c inner core, outer core, and mantle
d upper mantle, lower mantle, and crust

Explanation:

Earth's structure is divided into three primary, distinct layers. The innermost layer is the core, the middle thick layer is the mantle, and the outermost thin layer is the crust. Option A uses the incorrect term "surface" instead of crust. Options C and D only list subdivisions of the main layers, not the three main layers themselves.

Answer:

B. Core, mantle, and crust