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6th 7th
6th 7th

... • Plates Separate, too, not just collide • When plates separate, they leave a gap between the 2 plates and this allows magma or lava to rise from the earth’s interior to escape ...
Z SR Midterm Test Review
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The 5 Themes of Geography Power Point Presentation

... There are many ways to show a globe on a flat map. The interrupted projection map, on the left, shows real sizes and shapes of continents. The equal area map , below left, shows size accurately. The Peters projection, below, shows land and oceans areas and correct directions ...
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... _____ 23. Fossils provide evidence that Antarctica was once located a. at the North Pole. c. at the South Pole. b. near the equator. d. where it is now. _____ 24. The continents may once have formed one landmass called Pangaea which means a. all seas. c. all Earth. b. puzzle. d. landmass. _____ 25. ...
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8 th Grade Science Midterm Review (Ms. Mendoza)
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... – The magnetic field is due to the combined properties of the outer core  It is metallic AND it is liquid AND in motion  ALL THREE are required to produced the magnetic field – For example – Mercury has an iron core, but no magnetic field because it is solid! – Venus has a liquid iron core, but it ...
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... Earth’s mantle is driven primarily (8090%) by internal heating from the decay of long lived radioactive isotopes of potassium, uranium and thorium and not heat loss from the core (1020%). The pattern of convection for internal heating is different from bottom heating. ...
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... __________ b. Superstitions have been around forever. __________ c. People hold many superstitions beliefs about the moon. __________ d. Made of green cheese. Group 2 __________ a. The history of astronomy is interesting. __________ b. Ice age people recorded the appearance of new moons by making sc ...
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... and landmasses. Example: The island Surtsey was formed in the Atlantic Ocean from a volcanic eruption. 2. Destructive forces – slowly wear away mountains. Example: Ocean waves that wear away shorelines. What’s inside Earth? Geologists can’t dig to the center of the Earth. They use seismic waves stud ...
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Earth`s Interior and Plate Tectonics

... Structures on the ocean floor give evidence of a mechanism for movement or “continental drift” (magnetic rock bands) ...
Chapter 7, Section 1 - Answer Key
Chapter 7, Section 1 - Answer Key

... while the densest compounds make up the core? Heavier elements are pulled to the center of the Earth by gravity. The elements with less mass are further from the center. 4. List the three layers of the Earth, based on their chemical composition. Crust, mantle, core (outer and inner) 5. Complete Sent ...
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Earth Science - Wiki-by

... • Water is one of the most important substances on Earth. More than two-thirds of Earth’s surface is covered by water. • All people need fresh water, but most of Earth’s water is not fresh. • Most of the water on Earth is salt water. • Estuaries are places where fresh water from a river mixes with s ...
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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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