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... Name: _______________________________Date: _____________________________ Please read Chapter 3 and define the terms below. Complete the organizer on the backside. Some research will be required as not all terms are in your textbook. ...
Earth`s Layers Online Activity Directions: Dig into the Lithosphere
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... The border between the Outer core and the Inner Core is how many miles beneath the crust? ...
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Layers of the Earth

... 2. hypothesis that the continents have moved 1. largest layer of Earth's surface,composed slowly to their current locations mostly of silicon,oxygen,magnesium,and iron 6. rigid layer of Earth's surface made up of the 2. outermost layer of Earth's surface crust and a part of the upper mantle ...
Homework #1
Homework #1

... This measurement, along with the height of the obelisk, gave him the angle that the Sun appeared south of the zenith in Alexandria. The height of the obelisk was 30 meters and the length of its shadow was 3.79 m long. The Sun was not as high in the sky in Alexandria as in Syene at the same time of d ...
Journey To The Center of The Earth
Journey To The Center of The Earth

... hollow Earth. On the way, the explorers follow caves and tunnels down to a strange sea lit by a miniature sun. Develop your own story about taking a journey to the center of the earth. We now know a great deal about the Earth’s interior so your story should be scientifically accurate. Describe what ...
3rd Rock From the Sun - Scott County School District 1
3rd Rock From the Sun - Scott County School District 1

... Warm-Up 1. How far is the earth from the sun? ...
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10457761045776LP 10 ES 09

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Ch9
Ch9

... Comets delivered the volatiles (primarily water) to the inner planets some 4 billion years ago, just after the formation of the solar system. ...
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Plate Tectonics and Earth`s Interior

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Lecture 3 Review Sheet

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Chap. 1 Unit C Study Guide

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World Geography First Six Weeks Exam Review List the 5 themes of

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1. What analogy (comparison between two things) does

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Internal Forces- Rapid Changes to the Earth

... Internal Forces- Rapid Changes to the Earth The earth’s features are always changing, and sometimes those changes happen suddenly. Earth’s features may be referred to as Landforms. Geologists, or people who study the earth’s structure and history, can tell how old rocks are and the way different typ ...
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Cycles in the Lithosphere pages 54-60

... 1. The belief that the earth’s features were only 5-6 thousand years old, and were formed by violent, catastrophic events such as earth quakes and volcanoes is called ______________________________. This belief was popular up until the late___________________________________. The theory that the ear ...
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Plate Techtonics

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Assignment - 1

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... the tearing down of the Earth’s surface including weathering, erosion, impact of organisms, earthquakes, and volcanoes ...
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Plate tectonics Hydrosphere Magma Fault Outer Core Seismograph

... Scientific  theory  that  Earth’s  crust  is   made  of  moving  plates   ...
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Science Study Guide What is the hot molten rock

... What is the central opening in a volcanic area through which magma can escape called?  ...
The Earth`s Formation
The Earth`s Formation

... Gravity pulled the dust and gas toward the center of the cloud, causing the cloud to take on a spherical shape. This cloud started rotating, and the dust particles combined to form ______________________ The planetesimals combined to form _________________________________________________ The planete ...
200 300 400 500 100 200 300 400 500 100 200 300 400 500 100
200 300 400 500 100 200 300 400 500 100 200 300 400 500 100

... describe the creation of earth 1.The earth began to cool. 2.Energy heated the new planet to high temperatures 3.Earth’s molten surface hardened into rock. 4.Gas and rocky debris circling the sun crashed together. ...
earth*s shape, dimensions, and internal heat
earth*s shape, dimensions, and internal heat

...  Can go all the way around without falling off  The top of a ship’s mast is the first thing you see as it approaches your location (discovered by Magellan, 1522) ...
Quiz Study Guide Interior of Earth
Quiz Study Guide Interior of Earth

... List in order the layers of the Earth based on properties (behavior), and describe their properties. (Example: the inner core is solid and the outer core is liquid.) ...
< 1 ... 167 168 169 170 171 172 173 174 >

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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