19)
a small car and a large truck are driving down a highway, which statement would support the premise that the truck has more momentum?
a) a large truck has a much larger mass.
b) a car has a smaller engine than a truck.
c) a small car accelerate faster than a truck.
d) a large truck can travel at close to the speed of the car.

Momentum (M) is the product of the mass (m) of an object and its velocity (v). This may be mathematically expressed through the following equation.
                                   M = m x v
 If the large truck has more momentum than the small car, it either has a greater speed or greater speed than the car. The answer to the question above would be letter A. 

Magma  is composed of molten rock and is  stored  in the earth's crust. lava is  magma  that reaches the surface of our planet through a volcano vent.

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.