Chapter 31, Problem 7RAT

For clouds to form, air must be lifted. The principal lifting mechanisms are

(a) convectional, orographic, and frontal lifting.

(b) continental, orogeny, and occluded lifting.

(c) conversational. Orthodontic, and face lifting.

(d) stationary, occluded, and contact lifting.

To determine

The correct option for the statement “For clouds to form, air must be lifted. The principal lifting mechanisms are”.

Answer to Problem 7RAT

The correct option for the statement “For clouds to form, air must be lifted. The principal lifting mechanisms are” is option (a).

Explanation of Solution

The several lifting mechanisms in the atmosphere are Orthographic lift, frontal lift, convergence lift, and convective lift. The clouds form due to these lifting mechanisms.

Air moves vertically and the movement of air is in the vertically upward direction leads to its cooling and formation of clouds and precipitation, if the temperature of cooling air reaches below its dew point temperature. The air can lift over the mountain with orthographic lifting and due to frontal lifting, the warm air with particles closely packed lifts over the cold air.

Convection lifting occurs when solar energy passes through the atmosphere and heats the surface, where the air near the surface pushed upward.

Convergence lifting occurs when the air near the surface flows together and pushes upward when it squeezed together. Due to these lifting mechanisms, air drifts upward irrespective of gravity effect.

Conclusion:

Therefore, the correct option for the statement “For clouds to form, air must be lifted. The principal lifting mechanisms are” is option (a).