Which car has the most momentum? A. a 1,820 kg car traveling east at 30 m/s
B. A 2,270 kg car that is stationary
C. A 1.460 kg car that is traveling south at 80 m/s
D. a 730 kg car that is traveling north at 90 m/s

Momentum of an object depends upon mass as well as velocity of object. And in option D the mass is less but velocity is the highest and the car with highest mass is at rest.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).