Use the drop-down menus to complete each sentence about the layers of the atmosphere.
If the
w did not exist, Earth might be destroyed by chunks of rock from space.
The
is located 12 to 50 kilometers from Earth's surface.
Both the
M get colder as altitude increases.
The ozone in the
protects people from ultraviolet (UV) radiation.
has the highest temperature of any layer in Earth's atmosphere.
The
