4.When a layer of cool air at the surface of earth is found under a layer of warmer air above it, the result is known as *
A.the Coriolis effect
B. the greenhouse effect
C. a temperature inversion
D. an upwelling
Other:________________

5. Earthquake vibrations are detected, measured and recorded by instruments called *
A.sonargraphs
B.seismographs
C.Richter Scales
D. Magnetometers

6. Stars begin their life cycle in *
A. Black hole
B. a nova
C.a nebula
D. a supernova




​