Question

Q. When two different air masses meet, the boundary zone between them is called a front. In this context, consider the following statements:

Which of the above statements is/are correct?

• A.
  1 only
• B.
  2 only
• C.
  Both 1 and 2
• D.
  Neither 1 nor 2

Answer 1

The correct option is B

2 only
Explanation:

Statement 1 is incorrect: When the front remains stationary, it is called a stationary front.

Statement 2 is correct: 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.

Extra Information
When two different air masses meet, the boundary zone between them is called a front. The process of formation of fronts is known as frontogenesis. There are four types of fronts : cold, warm, stationary and occluded. When the cold air moves towards the warm air mass, its contact zone is called the cold front. If the warm air moves towards the cold air mass, the contact zone is a warm front. If the air mass is fully lifted above the land surface, it is called the occluded front.