Which gas in the upper atmosphere shields Earth's surface from the sun's harmful ultraviolet rays?
A) nitrogen
B) methane
C) ozone
D) chlorofluorocarbons
Question 2
The forecasting technique that produces several versions of a forecast model, each beginning with slightly different weather information to reflect errors in the measurements, is called ____ forecasting.
A) climatology
B) probability
C) persistence
D) ensemble