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Objective 8 - Reading Guide pages 150
Objective 8 - Reading Guide pages 150

... When two plates converge, the result is called a _________________________. When two plates collide, the _____________________ of the plates determine which one comes out on top. ________________________ crust becomes __________________ and denser as it spreads away from the mid-ocean ridge. Where t ...
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... crust and core. • The mantle is the layer under the crust. • It is up to 2,897 kilometers(1,800 miles -from here to Arizona) thick. • The mantle is made up of rocks such as silicon, aluminum, iron, and magnesium. • Top layer - hot solid rock 1590 degrees Fahrenheit • Bottom layer - hot liquid rock 3 ...
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SCHOOL---SCIENCE---Grade-3---Earth-Changes

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Ch. 1 Tools of Geography Study Guide

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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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