The main gas found in the atmosphere is:

The percentage of oxygen in the atmosphere is:

The lowest layer (the closest to Earth) of the atmosphere is:

The ozone layer is found in the:

The outer layer of the atmosphere is the:

All weather phenomena occur in the:

Satellites orbit in the:

Which of the following is NOT a function of the atmosphere?

To measure atmospheric pressure we use:

Clouds are formed by:

Any form of water that falls to the Earth is:

Clouds that bring lightning are:

The cloud of the image is a:

Low, grey clouds that completely cover the sky are:

Which of the following gases is responsible for global warming?

Gases that prevent heat from scaping Earth's surface are called:

Feather-like clouds formed at high altitudes are:

As a consequence of this, more ultraviolet radiation reaches the Earth:

Which of the following are good for the atmosphere? Mark all the ones that you think are correct.