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Earth`s Interior PP
Earth`s Interior PP

... 7,200 – 9,000 degrees hot! ...
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Natural Disasters

... other object in the entire universe! It is this pull that creates weight. It is this pull that causes an object to fall. Such a pull is called a force. The force that causes an object to fall is the force due to gravity. Gravity on the earth is constant... All objects fall equally fast. If we think ...
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Earth Space EOC Review Test #1 NAME

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... Earth’s Geology and Astronomy • The solar system formed about 4.6 billion year ago • Astronomical Age must coincide with geological age determined from rocks (radioactive dating) • Terrestrial planets lost H, He (primary and primordial constituents of the solar nebula), but Jovian planets retain la ...
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Origin of Life - Hicksville Public Schools

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Physics 127 Descriptive Astronomy Homework #11 Key (Website

... of the earth's surface is made of oceanic crust that is less than 200 million years old, and the very oldest earth rocks are about 4 billion years old. If the earth and moon are essentially the same age, why is there such a disparity in the ages of rocks on the two worlds? The surface of the earth i ...
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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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