Category: atmosphere and air...

the atmospheres of the different planets
Earth's atmosphere is a mixture of gases, primarily nitrogen and oxygen, commonly called air
the composition of the atmosphere encodes a great deal of information about its origin
the blanket -- colorless, tasteless, odorless -- of air about 440 miles deep, surrounding the Earth protecting us from the dangerous rays of the Sun and from the cold of outer space
homosphere and heterosphere, troposhere, stratosphere, mesosphere, exosphere, and ionosphere
helping to protect the ozone layer
the beauty of the oxygen cycle -- gases continuously circulating between the atmosphere and living things -- making it possible for us to live here
the weight of all the air above pushing down on us
the atmosphere is colorless, tasteless, and odorless
Earth is sometimes called the Goldilocks planet because the conditions are like Baby Bear's porridge - just right!
If the air is cold it sinks, pushing down to create a higher pressure on Earth. As the air is squashed, it warms - usually bringing nice weather. If the air is warm, it rises, so there is a lower pressure on Earth. The warm air may also evaporate water from the sea and take it up to form clouds, possibly bringing rain.