Where do weather changes occur?
In the troposphere
In the stratosphere
In the ionosphere
The ozone layer is in the mesosphere
The ozone layer protects us from ....
meteors
comets
ultraviolet rays
all of these
The mesosphere is colder than the stratosphere.
The mesosphere protects us from ....
both of these
The shooting stars we see in the night sky are .....
meteors entering the mesosphere
reflections of light from ice crystals in the mesosphere
glowing gases produced by the collision of meteors with ice crystals in the mesosphere
The astronauts use space suits because the thermosphere is ....
very hot
contains very little oxygen
Part of the thermosphere is electrically charged.
Telecommunications are possible because of the satellites in the .....
stratosphere
ionosphere
exosphere
The aurora phenomenon is caused by the existence of ....
ice crystals in the mesosphere
ions in the thermosphere
oxygen in the troposphere
