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Photo Credit: Science NetLinks Introduction In this simulation, you will use small pieces of candy marked on one side.
Purpose To develop the idea that carbon dating is based on gathering evidence in the present and extrapolating it to the past. Students will use a simple graph to extrapolate data to its starting point. Context
(Provided courtesy of Think Green ) Level: K-5 Time Frame: 1 initial session with additional observation days ABOUT THIS LESSON : (PDF version) In this lesson, students learn how decaying organic matter can be harvested as a source of energy. After brainstorming ways that old metal, plastic, and paper can be a resource, students are challenged to find use for an old piece of fruit.
Photo Credit: Science NetLinks Purpose To demonstrate that the rates of decay of unstable nuclei can be measured, that the exact time that a certain nucleus will decay cannot be predicted, and that it takes a very large number of nuclei to find the rate of decay. Context This is the second lesson in a three-lesson series about isotopes, radioactive decay, and the nucleus.
Looking at the numbers above, you'll immediately notice that you are different ages on the different planets. This brings up the question of how we define the time intervals we measure. What is a day? What is a year? The earth is in motion.
Our Cosmic Neighborhood From our small world we have gazed upon the cosmic ocean for thousands of years. Ancient astronomers observed points of light that appeared to move among the stars. They called these objects "planets," meaning wanderers, and named them after Roman deities—Jupiter, king of the gods; Mars, the god of war; Mercury, messenger of the gods; Venus, the goddes of love and beauty, and Saturn, father of Jupiter and god of agriculture. The stargazers also observed comets with sparkling tails, and meteors or shooting stars apparently falling from the sky. Since the invention of the telescope, three more planets have been discovered in our solar system: Uranus (1781), Neptune (1846), and, now downgraded to a dwarf planet, Pluto (1930).