According to the process of isostatic adjustment,
a. thin sections of crustal material float higher than thicker slabs.
b. crustal slabs adjust very rarely.
c. thick sections of crustal material float higher than thinner slabs.
d. mountains are lowered as they become older.

The correct answer is C. thick sections of crustal material float higher than thinner slabs.

Explanation:

It is known that on the ocean floor are deposited most of the materials that are will be carried by different streams of water. The weight that is added to the area causes the ocean floor to sink by isostatic adjustment and there is a process called subsidence.

multiple

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.