Question

Use the weather map to answer the question.

What do the blue and red lines indicate?

A cold front is moving to the north and west before a warm front moves through.
A cold front is moving to the south and east before a warm front moves through.
A warm front is moving to the north and east before a cold front moves through.
A warm front is moving to the south and west before a cold front moves through.

Answer 1

The blue and red lines indicate is b. A cold front is moving to the south and east before a warm front moves through.

The blue line with triangles pointing to the right indicates a cold front, which is the leading edge of a colder air mass moving in to replace a warmer air mass.

The red line with semicircles pointing to the right indicates a warm front, which is the leading edge of a warmer air mass moving in to replace a colder air mass.

So, On the weather map, the blue line is ahead of the red line, which means that the cold front is moving faster than the warm front. This means that the cold front will move through first, followed by the warm front.