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Michael learned that the movement of Earth in the solar system causes changes that can be seen on the planet. Which change could be seen on Earth in the time it takes Earth to rotate once on its axis?

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In a comparison of metals to nonmetals, metals tend to have

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A student wants to create a model showing the most important reason why old gasoline should never be poured into the soil. Which of the following must be included in the model?

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A potassium (K) atom has 20 neutrons, 19 protons and 19 electrons. What is the atomic mass of potassium?