Which gas is beneficial to us not being fried by UV rays?

Which two properties characterize an air mass?

Which layer of the atmosphere contains weather, clouds, pollution and life forms?

The characteristics of an air mass which formed over the Gulf of Mexico would probably be

Which produces strong winds and powerful waves, and can cause heavy flooding?

They are the highest clouds in the sky. They look curly, white and feathery. Usually it means good weather.

This is sometimes called a thunderhead cloud. It looks very tall like mountains and heavy rain comes from it.

The density of air is greater ________.

Lines on a weather map that connect equal points of air pressure