Fact 1: Cold fronts cause thunderstorms as they pass by. Fact 2: If cold air replaces warm air, it is called a cold front. Given the two facts above, what does cold air replacing warm air cause?
Select from: i. Greenhouse gases; ii. Pollution; iii. Dehydration; iv. thunderstorms; v. steady barometer readings; vi. hypothyroidism; vii. constant air pressure; viii. stagnant air temperature;
Answer:
iv.