A reaction that combines simpler reactants to form a new compound is called a O concentration reaction
O decomposition reaction
O combustion reaction
O synthesis reaction

A reaction that combines simpler reactants to form a new compound is called a

m=9

step-by-step explanation:

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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