You are presented with the question "What does cold air replacing warm air cause?" and the following answer choices: - Greenhouse gases - Pollution - Dehydration - thunderstorms - steady barometer readings - hypothyroidism - constant air pressure - stagnant air temperature Now knowing that cold fronts cause thunderstorms as they pass by and if cold air replaces warm air, it is called a cold front, choose the best answer.
Answer:
thunderstorms