Question | Answer |
What is the atmosphere made up of? | a mixture of atoms and molecules of different kinds |
What makes up a molecule? | it is made up of 2 or more atoms |
What is the earth's atmosphere made up of? | nitrogen, oxygen, carbon dioxide, water vapor, and many other gases, as well as particles of liquids and solids |
What is the most common gas in the atmosphere? | nitrogen |
Approximately, how much nitrogen is in the air we breathe? | 3/4 or 78% |
What is the movement cycle of nitrogen? | the air to the soil, into living things, and then back into the air |
What is the second most abundant gas in the atmosphere? | oxygen |
Approximately, how much oxygen is in the air we breathe? | 1/4 or 21% |
What do plants and other organisms use light for? | to convert water and carbon dioxide into oxygen and to produce food |
What is an example of a process that uses oxygen quickly? | a fire burning |
What is an example of a process that uses oxygen slowly? | iron oxide, or rust forming on steel |
What is in a nitrogen molecule? | 2 nitrogen atoms |
What is in an oxygen molecule? | 2 oxygen atoms |
What is in a carbon dioxide molecule? | 1 carbon atom & 2 oxygen atoms |
What do plants do with the carbon dioxide they get from the air? | they make food |
When plant and animal cells break down food to produce energy, what waste product do they give off? | carbon dioxide |
What 2 gases make up 99% of dry air? | nitrogen & oxygen |
What are the other 2 gases that make up the majority of the 1% of dry air? | argon & carbon dioxide |
What is a form of oxygen that has three atoms of oxygen, rather than two? | ozone |