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Name: Date: Period: ______ Chapter 13 Study Guide 1. What is soil
Name: Date: Period: ______ Chapter 13 Study Guide 1. What is soil

... The three main layers of the Earth are the crust, mantle, and core. The crust is the outermost layer and the least dense. It contains both continental and oceanic crust. The mantle is the largest layer and contains both the lithosphere and the asthenosphere. The core is the center-most layer made up ...
Earth Space Science Week8
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Plate Tectonics Unit Assessment Study Guide Answers

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02 HW Our Dynamic Earth

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Grade Seven - Science - Miami

... theory? Sample Response: Earth’s tectonic plates are in slow, constant motion, driven by convection currents (cyclical movement that transfers heat) of material in the mantle. Earth’s plates move because they are on top of the large convection currents in Earth’s mantle and may move towards, away fr ...
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Spherical Earth



The concept of a spherical Earth dates back to around the 6th century BC, when it was mentioned in ancient Greek philosophy, but remained a matter of philosophical speculation until the 3rd century BC, when Hellenistic astronomy established the spherical shape of the earth as a physical given. The paradigm was gradually adopted throughout the Old World during Late Antiquity and the Middle Ages. A practical demonstration of Earth's sphericity was achieved by Ferdinand Magellan and Juan Sebastián Elcano's expedition's circumnavigation (1519−1522).The concept of a spherical Earth displaced earlier beliefs in a flat Earth: In early Mesopotamian mythology, the world was portrayed as a flat disk floating in the ocean and surrounded by a spherical sky, and this forms the premise for early world maps like those of Anaximander and Hecataeus of Miletus. Other speculations on the shape of Earth include a seven-layered ziggurat or cosmic mountain, alluded to in the Avesta and ancient Persian writings (see seven climes).The realization that the figure of the Earth is more accurately described as an ellipsoid dates to the 18th century (Maupertuis).In the early 19th century, the flattening of the earth ellipsoid was determined to be of the order of 1/300 (Delambre, Everest). The modern value as determined by the US DoD World Geodetic System since the 1960s is close to 1/298.25.
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