In which one of the following fronts, warm air is completely displaced from the ground surface?
Occluded front
An occluded front forms when a cold front overtakes a warm front. The warm air in the intervening warm sector is lifted off the ground, leaving colder air masses in contact at the surface.
Consider the following salient features of Tornado and choose the correct option:
A. Tornadoes are very violent rotating systems of air
B. The pressure in the center of tornado is extremely low
C. The movement of tornadoes is in well-defined route and direction
D. The arrival of tornado is heralded by dark and thick clouds in the sky
Choose the correct answer from the options given below :