Use the table to answer the question.
Days sunny and warm
1. A warm air replaced by an cold air mass
2 cloudy and rainy
3 drop in temperature
4 clear skies and cold temperatures
A student tracks the daily weather. The student’s observations are logged in the table. Which factor in the atmosphere best explains the student’s observations?
1. A warm air mass replaced a cold air mass.
2. A cold front moved into the area.
3. High levels of moisture are contained within an air mass.
4. A warm front moved into the area.