Layers
In what layer does weather occur?
Troposphere
What gas makes up 78% of the atmosphere?
Nitrogen
What tool measures air pressure?
Barometer
What process takes carbon dioxide out of the air?
photosynthesis
What is the greenhouse gas effect?
Trapping heat in the atmosphere, just like a greenhouse traps heat
Which layer contains the ozone layer?
Stratosphere
What gas makes up 21% of the atmosphere?
Oxygen
What type of map shows air pressure?
Isobaric
What organisms break down dead materials in the carbon and nitrogen cycle?
decomposers
Name 2 greenhouse gases
Carbon dioxide
Water vapor
Methane
Nitrous Oxide
Which layer contains clouds and weather?
Troposphere
Trace gases
What kind of air pressure causes more clouds to form?
low air pressure
Without plants, there would be less of this gas in the atmosphere:
Oxygen
What human activity adds carbon dioxide to the atmosphere?
burning fossil fuels
How are the layers of the atmosphere divided?
by changes in temperature
Why is the ozone layer important?
it blocks harmful UV radiation
What kind of air pressure is linked to clear skies?
high air pressure
What process turns nitrogen gas into a usable form for plants in the soil?
lightning and nitrogen fixation
Which layer of the atmosphere is affected by greenhouse gases?
Troposphere
List the layers of the atmosphere starting with the layer closest to the Earth.
Troposphere --> Stratosphere --> Mesosphere --> Thermosphere --> Exosphere
How did oceans change Earth's early atmosphere?
decreased carbon dioxide in the air
What forms when air pressure is low and moisture rises?
clouds
What is the name of the process where bacteria release nitrogen into the air?
Denitrification
What happens if greenhouse gases increase too much?
global warming/climate change