The correct answer is Statement ‘A’ and ‘B’ are both correct. • The structure of the earth is made up of three things:- • Crust • Mantle • The Core • Crust:- • The crust is the outermost solid part of the earth. • Earth's crust is made of elements, minerals, and rocks. • About 98% of the total crust is made up of eight elements as oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium. • The rest is constituted by elements like titanium, hydrogen, phosphorous, manganese, sulfur, carbon, nickel, and others. • Mantle:- • The portion of the interior beyond the crust is called the mantle. It is a solid-state. • The thickness ranges from 10-200 km. • Its density is higher than the crust. • The crust and the uppermost part of the mantle are called the lithosphere. • The Core:- • The core-mantle boundary is positioned at the depth of 2,900 km. • The inner core is in the solid-state whereas the outer core is in the liquid state. • The core is made up of very heavy material mostly constituted by nickel and iron. Hence it is also called the “nife” layer.