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Essential Question #3 Review Sheet
Essential Question #3 Review Sheet

...  Username is your school e-mail address  Password is central You should be able to: 1. Define and give examples (agents) of weathering, erosion and deposition. 2. Identify steps and process of the rock cycle. 3. Label a diagram of the inside of the Earth. 4. Describe the theories of Continental Dr ...
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Grand Challenges for Seismology

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... Those pieces of Earth’s crust — the South American plate and the Nazca plate, a big slab of seafloor that lies just west of South America — are colliding at an average speed of several centimeters per year. “This is one of the fastest plate convergence rates on Earth,” Lin notes. Rather than moving ...
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Unpacking Outcomes - NESD Curriculum Corner

...  Provide examples of past theories and ideas (incl. cultural mythology) that explain geological phenomena  Construct a visual representation of composition of Earth  Create models or simulations of process of mountain formation and fold, faulting  Describe societal and environmental impacts of c ...
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Schiehallion experiment



The Schiehallion experiment was an 18th-century experiment to determine the mean density of the Earth. Funded by a grant from the Royal Society, it was conducted in the summer of 1774 around the Scottish mountain of Schiehallion, Perthshire. The experiment involved measuring the tiny deflection of a pendulum due to the gravitational attraction of a nearby mountain. Schiehallion was considered the ideal location after a search for candidate mountains, thanks to its isolation and almost symmetrical shape. One of the triggers for the experiment were anomalies noted during the survey of the Mason–Dixon Line.The experiment had previously been considered, but rejected, by Isaac Newton as a practical demonstration of his theory of gravitation. However, a team of scientists, notably Nevil Maskelyne, the Astronomer Royal, were convinced that the effect would be detectable and undertook to conduct the experiment. The deflection angle depended on the relative densities and volumes of the Earth and the mountain: if the density and volume of Schiehallion could be ascertained, then so could the density of the Earth. Once this was known, then this would in turn yield approximate values for those of the other planets, their moons, and the Sun, previously known only in terms of their relative ratios. As an additional benefit, the concept of contour lines, devised to simplify the process of surveying the mountain, later became a standard technique in cartography.
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