The air around you
What is the must abundant gas in the atmosphere?
nitrogen
what is an air column?
column of air above you that exends
where is most of the gas found in the atmosphere?
close to the earth
electromagnetic waves are called what?
rediation
thermal energy measures the?
total of motion
How much nitrogen occurs in all living things?
3 peercent
why is the atmosphere heavy?
Its weight exerts a force on surfaces like you
which layer on the earth is changing?
the lowest
does the sun give off ultraviolet radiation?
yes it does
air temperature is usually measured with a?
thermometer?
oxygen is the first or second most abundant gas in the atmosphere?
second
How do you know air exists?
because air has mass, it also has other properties, including density and pressure
how many kilometers does the atmosphere have?
12 kilometers
ultraviolet radiation can cause _____?
sunburn
what is a thermometer do?
it measures temperatures
how much does carbon dioxide make up?
1 percent
What is the force pushing on an area or surface is called what?
pressure
the stratosphere extends from the troposphere about?
50 kilometers
nearly all the energy in the earths atmosphere comes from the ____?
sun
temperature is measured in units called_______?
degrees
oxygen and nitrogen make up?
99 percent of dry air
Air pressure is the result to what?
weight
how cold is the stratosphere?
60´C
what energy travels to earth as ________ _______?
electromagnetic waves
temperature is what?
the average amount of energy