1.)Seventy-Eight percent of the air is made up of
A. Nitrogen
B.Oxygen
C.Helium
D.Carbon Dioxide
2.)Burning can only take place in the presence of
A.Nitrogen
B.Oxygen
C.Helium
D.Carbon Dioxide
3.)The layer of the atmosphere that reflects radio signals is the
A.Mesosphere
B.Stratosphere
C.Thermosphere
D.Trostophere
4.)A wind that blows from the northeast is a
A.Southeast Wind
B.Moonsoon
C.Local wind
D.Northeast Wind
HOPE IT HELPS.
