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

Answer:

They must collide with each other.

Explanation:

is the answer of your question

Answer 2

⸙ What must occur for air masses to form fronts?

$\circ \: \: { \underline{ \boxed{ \sf{ \color{red}{Answer.}}}}}∘$

✅ They must collide with each other.

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

$\bold{ \green{ \star{ \orange{Hope\:it\:helps.}}}}⋆$