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Geology - The scientific study of the origin, history, and structure of
Geology - The scientific study of the origin, history, and structure of

... plate tectonics theory holds that the lithosphere, the hard outer layer of the earth, is divided into about 7 major plates and perhaps as many as 12 smaller plates, c.60 mi (100 km) thick, resting upon a lower soft layer called the asthenosphere. Because the sides of a plate are either being created ...
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01 00_Earth_Layers 1

... I CAN… Identify the layers of the earth and explain the different characteristics. ...
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... ground to fracture. S waves are secondary waves which cause ground to shake up and down. Surface waves arrive last and travel along the surface like rolling ocean waves. ...
The Quran on Mountains DOC
The Quran on Mountains DOC

... to describe mountains on the basis of this information is the word ‘peg,’ since most of a properly set peg is hidden under the surface of the ground. The history of science tells us that the theory of mountains having deep roots was introduced only in the latter half of the nineteenth century.3 Moun ...
Unit 1:Geography: Its Nature and Perspectives
Unit 1:Geography: Its Nature and Perspectives

... Movement is limited by factors:  Distance: As distance increases, interaction decreases  Friction of Distance: Costs incurred for moving, ie. ...
Geology 101
Geology 101

... 12. The extinction of the dinosaurs has puzzled earth scientists for a long time. About 15 years ago a hypothesis was proposed that mass extinctions, such as the one in which the dinosaurs became extinct, were created by the collision of meteorites and/or comets and the Earth. In the past 15 years a ...
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Plate Tectonics Vocabulary Words

... The crust makes up less than 1% of the Earth’s mass. • We are on the Crust right now. ...
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... climb a mountain weather can change very quickly up mountains. In just a few minutes it can be perfectly clear and then a thunder storm can, and in a few hours the temperatures can drop and rise from hot temperatures to freezing temperatures. All mountains have one major characteristic in common - c ...
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The Mid-Atlantic Ridge and Geomagnetism

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Layers of the Earth, Continental Drift, and Plate Tectonic Overview
Layers of the Earth, Continental Drift, and Plate Tectonic Overview

... 5. List three puzzling occurrences that the theory of continental drift helped to explain, and describe how it explained them. 6. Explain why Wegener's theory of continental drift was not accepted at first. 7. List and describe three possible driving forces of tectonic plate motion. 8. How do the th ...
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Geology Study Guide

... make the statement true. _________________ 3. Formed in the mantle, molten material called lava cools to form minerals below Earth’s surface. _________________ 4. Narrow bands of mineral called veins form underground from solutions. _________________ 5. The repeating pattern of atoms in a mineral fo ...
oceanic - geography and history 1eso social studies
oceanic - geography and history 1eso social studies

... It is when rock is broken into smollar pieces by phisical processes. It is most likely to occur in areas of bare rock where there is no vegetation to protect the rock from extremes of weather: •Freeze-thaw or frost shattering •Exfoliation or onion weathering. ...
PS review Earth
PS review Earth

... Weather and Climate • Weather refers to the atmospheric conditions at a certain location at a given time. • Climate refers to weather patterns occurring over an extended period of time. • Climate is influenced by latitude, topography (landforms), air circulation, and ocean currents. • Coastal areas ...
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Earth From Crust to Core

... a thin crust with cracks like the earth’s tectonic plates, but has no liquid portion in its core, for example.) 2. Using boxes and dough, create more accurate models of the planet’s layers. Have students follow the steps below. • Cut the top off of the box. Turning the box so that the larger face is ...
Ground Resistance or Impedance?
Ground Resistance or Impedance?

... The capacitance of the ground system dominates during the steep rising front of the impulse by providing a path to ground for these high frequency components. To assist this process, the capacitance of the ground system should be maximized. In practice this means that the surface area of contact ma ...
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GY 112 Lecture Notes

... is locked toward us. The gradual slowing of the Earth’s and moon’s spin has other ...
Planet Earth Section 1
Planet Earth Section 1

... all of the continents might have been part of one landmass in the past before they drifted apart. Wegener pieced the continents together like a puzzle and called the supercontinent they formed Pangaea. Wegener found nearly identical fossils on widely separate continents, which supported his idea. ...
The Dynamic Earth - Moore Public Schools
The Dynamic Earth - Moore Public Schools

... • The atmosphere is the mixture of gases that makes up the air we breathe. • The hydrosphere makes up all of the water on or near Earth’s surface. • The biosphere is the part of Earth where life exists. It includes parts of the geosphere, atmosphere, and hydrosphere. ...
Ch.1 - Looking at the Earth
Ch.1 - Looking at the Earth

... • The question “How are places similar or different?” refers to a region. • A region is an area of the earth’s surface with ...
Plate Tectonics
Plate Tectonics

... silicon than the crust • Is denser than the crust ...
Planet Earth in Cross Section
Planet Earth in Cross Section

... Outer Core - A layer surrounding the inner core that is about 2270 kilometers thick and which has the properties of a liquid. Mantle – A solid, 2885-kilometer thick layer of ultra-mafic rock located below the crust. This is the thickest layer of the earth. Asthenosphere – A partially melted layer of ...
Inner Structure of the Earth 3. Mantle
Inner Structure of the Earth 3. Mantle

... Plates pull away from each other and form a spreading zone. These areas are likely to have earthquakes, volcanoes, and rift valleys (a large split along the crest of a mountain). ...
Quiz Maker - Geneva 304
Quiz Maker - Geneva 304

... 1. List some topics that each of the four major divisions of Earth Science cover. 2. List some reasons why we should study Earth Science. 3. How does a hypothesis become a theory? Why do scientists use models? 4. Compare and contrast independent, dependent, and extraneous variables. 5. List and brie ...
Layers of the Earth
Layers of the Earth

... Definition: This layer of the earth lies between the mantle and the solid inner core. It is the only liquid layer, a sea of mostly iron and nickel ...
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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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