When a (blank 1) air mass moves toward a warmer air mass, it causes a cold front. the (blank 2) air rises, leaving (blank 3) temperatures in the region. on a weather map, a blue line with (blank 4) represents the front.

blank 1: cold, warm
blank 2: cold, warm
blank 3: colder, warmer
blank 4: semicircles, triangles

Blank 1 : cold

Blank 2: warm

Blank 3: colder

Blank 4: semicircles

Explanation:

when a cold air mass moves toward a warmer air mass, it causes a cold front. the warm air rises, leaving colder temperatures in the region. on a weather map,a blue line with semicircles represents the front.

this process of movement of a cold air mass towards a warmer air mass is called a A cold weather front.

semicircles are used to represent weather fronts in a weather map.the only difference between the semicircle of a cold weather front and a hot weather front is the color associated with the semicircles. instead of triangles.

river is shown in this type of map