| A | B |
|---|
| A chemical in the Earth's atmosphere that absorbs most of the ultraviolet radiation before it reaches the Earth's surface | ozone (three parts oxygen) |
| The lowest layer of the Earth's atmosphere that contains the air we breathe and it is where the clouds occur and planes fly | troposphere |
| The layer above the troposphere that contains the ozone that protects the Earth | stratosphere |
| How does ozone enter the stratosphere? | oxygen gas is exposed to ultraviolet radiation in the upper regions of the stratosphere |
| Chemicals that consist of chlorine, flourine, and carbon. They are made in a lab and are nontoxic and stable. They are used as refrigerants in plastic foams, and a propellants in spray cans. | chloroflourocarbons |
| Anything that has mass and takes up space | matter |
| a measurement that reflects the amout of matter | mass |
| A measurement of the amount of matter and the Earth's gravitational pull on that matter | weight |
| the study of matter and the changes that it undergoes | chemistry |
| An organized process used by scientists to do research and provides a method for scientists to verify the work of others | scientific method |
| The act of gathering information | observation |
| Information that describes the color, shape, odor or some other physical characteristic | qualitative data |
| Information that tells you how much, how little, how big, how tall, or how fast. | quantitative data |
| A tentative explanation for what has been observed | hypothesis |
| A set of controlled observations that test the hypothesis | experiment |
| The variable that you plan to change | independent variable |
| A variable that changes in response to a change in the independent variable | dependent variable |
| A factor that is not allowed to change in the experiment | constant |
| A standard for comparison | control |
| A judgment based on the information obtained | conclusion |
| An explanation that has been supported by many, many experiments. It states a broad principle of nature that has been supported over time | theory |
| A relationship in nature that is supported by many experiments like Newton's law | scientific law |
| seeks to gain knowledge for the sake of knowledge itself | pure research |
| research undertaken to solve a specific problem | applied research |
| the practical us of scientific information that is concerned with making improvements in human life and the world around us | technology |
| A system of standard units | metric system |
| The revised system of standard units | SI or Systeme Internationale d'Unites |
