Which one of the following statements about the thermosphere is true?
Select one:
a. The thermosphere contains very few molecules of
gas. These are primarily helium and hydrogen.
O b. The area beyond the thermosphere is made of
oxygen and nitrogen and is called interplanetary
space.
O c. The aurora borealis (northern lights) that occur in
the thermosphere are navigational reflections
from high-flying, stealth aircraft.
O d. The thermosphere is located between the
stratosphere and the mesosphere.
O e. The thermosphere is very hot at the mesopause,
but cools down significantly with increasing
altitude.