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| Living things can exist on Earth because _, a chemical in Earth's atmosphere, absorbs most of the radiation from sun before it reaches Earth's surface |
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| Ozone consists of _ particles of oxygen. (number) |
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| Lowest layer of earth's atmosphere? |
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| True or false. Clouds are found in the troposphere. So are airplanes and all of Earth's weather. |
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| Ozone is located in which layer of the atmosphere? |
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| About _% of Earth's ozone is spread out in a layer that surrounds and protects our earth. |
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| What is formed when oxygen gas is exposed to ultraviolet radiation in the upper regions of the stratosphere? |
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| What is a chemical that consists of chlorine, fluorine, and carbon? |
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| True or false. CFC's readily react with other chemicals. |
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| coolants in refrigerators, coolants in Ac's, plastic foams, propellants in spray cans |
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| What is the study of matter and the changes that it undergoes? |
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| What is anything that has mass and takes up space? |
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| what is a measurement that reflects the amount of matter |
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| True or false. Heat, light, radio waves, and magnetic fields are matter. |
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| _ is a measure not only of the amount of matter but also of the effect of Earth's gravitational pull on that matter. |
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| What does the word macroscopic mean? |
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| matter that you do not need a microscope to see. |
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| What is a systematic approach used in scientific study that is an organized process used by scientists to do research? |
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| What are the steps to the scientific method? |
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| Observation. Hypothesis. Experiment. Conclusion. Theory. scientific law. |
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| _ data is information that describes color, odor, shape, or some other physical characteristic. |
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| _ data tells you how much, how little, how big, or how tall. It's when scientists measure temperature, pressure, or volume. |
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| A _ is a tentative explanation for what has been observed. ; educated guess |
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| True or false. A hypothesis means nothing unless there are data to support it. |
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| An _ is a set of controlled observations that test the hypothesis. |
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| Difference between independent and dependent variable? |
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| independent is the one that you plan to change; dependent is when its value changes in response to a change in the independent variable. |
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| What is a control in an experiment? |
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| standard for comparison' like a test tube out of three that all have different substances |
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| A _ is a judgement based on the information obtained. |
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| True or false. A model cannot be tested nor used to make predictions. |
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| A _ is an explanation that has been support by many, many experiments.; However they are still subject to new experimental data. |
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| _ research seeks to gain knowledge for the sake of knowledge itself. |
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| _ research is research undertaken to solve a specific problem. |
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| _ is the practical use of scientific information |
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