Meteorology

Choose the Correct Answer

Correct Answer : Option a

Explanation
First pair is not correctly matched: When two different air masses meet, the boundary zone between them is called a front. The process of formation of the fronts is known as frontogenesis. There are four types of fronts: (a) Cold; (b) Warm; (c) Stationary; (d) Occluded. A stationary front forms when a cold front or warm front stops moving. This happens when two masses of air are pushing against each other, but neither is powerful enough to move the other. Winds blowing parallel to the front instead of perpendicular can help it stay in place. A stationary front may stay put for days. If the wind direction changes, the front will start moving again, becoming either a cold or warm front. Or the front may break apart.

Second pair is not correctly matched: If an air mass is fully lifted above the land surface, it is called the occluded front. The fronts occur in middle latitudes and are characterised by steep gradients in temperature and pressure.
They bring abrupt changes in temperature and cause the air to rise to form clouds and cause precipitation.
Third pair is correctly matched: When the cold air moves towards the warm air mass, is contact zone is called the cold front, whereas if the warm air mass moves towards the cold air mass, the contact zone is a warm front.