Question

What must occur for air masses to form fronts?

They must increase in strength.
They must collide with each other.
They must move from west to east.
They must create air-pressure differences.​

Answer 1

it is B did the test

Step-by-step explanation:

Answer 2

For a front to occur, two different masses of air need to collide with each other.

Step-by-step explanation:

• The fronts formed by colliding air masses are literally the zones of transition where two air masses flowing towards each other meet and stop each other from gushing further horizontally.

• These colliding air masses are generally warm and cold in nature.

• The cold air masses usually flow from temperate zone towards the tropical zone, whereas, warm air masses flow from the tropical zone towards the temperate zone.