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... two objects move away from each other. So, a divergent boundary is a boundary where two tectonic plates are moving away from one another(41). Where plates pull apart, hot molten rock emerges as magma(42) and so new matter is added to the plates. This is also accompanied by earthquakes. When the magm ...
Seismic Waves - Fort Thomas Independent Schools
Seismic Waves - Fort Thomas Independent Schools

... 4. If one string is thicker than the other at the same tension, what happens to the pitch 5. If two bottles have water in them, one more than the other, which will produce a higher pitch when someone blows over the opening? 6. If one chime is longer than another, which will produce the higher pitch. ...
Plate Boundaries $100
Plate Boundaries $100

... less. What is this key piece of evidence ...
Mountain-building processes
Mountain-building processes

... __________ Prediction Scientific methods have been developed to predict when and where hazards will occur. ...
Oxford University Press 2001
Oxford University Press 2001

... __________ Prediction Scientific methods have been developed to predict when and where hazards will occur. ...
Review Sheet for Test
Review Sheet for Test

... 6.) Define sea floor spreading, and magnetic reversals Sea floor spreading is the process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies ( lab) Magnetic Reversals Earth’s magnetic pole have changed places. This is one of the ...
seismic tomography
seismic tomography

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Chapter C-1 Lesson 2
Chapter C-1 Lesson 2

... two plates are colliding into each other. The “wrinkle” or mountains may form some distance away, not always right at the edge of where the plates bump into each other. ...
seismic tomography
seismic tomography

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Layers of the Earth
Layers of the Earth

... crust under the continents The crust can range from ____________ thick (oceanic) to _____________ thick (continental) Plate Tectonics _________________________________________ is where we find the plates. The crust is attached to the plates ...
Slideshow
Slideshow

... there is no solid crust. •Magma forces its way into the cracks and makes its way to the surface to form volcanoes. •In this way new land is formed as the plates gradually pull apart. ...
Allan Cox - National Academy of Sciences
Allan Cox - National Academy of Sciences

... material that over time has been magnetized alternately in the normal and reverse direction. Allan’s observation that the sea-bottom magnetic orientations do indeed show this alternation, with a timing parallel to that shown by the Cox-Doell-Dalrymple calendar, is strong support for the hypothesis. ...
Document
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... Why would destroying natural coastal barriers (ex. mangrove swamps) contribute to extreme weather across many systems? How would rebuilding places destroyed by natural hazards contribute to re-building of the system? Why do people build cities along plate boundaries? ...
plate tectonics study guide
plate tectonics study guide

... mid-ocean ridge — a continuous mountain chain on the floor of all major ocean basins which marks the site where new ocean floor is created as two lithospheric plates move away from one another. normal polarity — a magnetic field that has the same direction as the Earth's present one. North is toward ...
Earth as a System - Salem Community Schools
Earth as a System - Salem Community Schools

... • The ultimate source of energy for almost every ecosystem is the sun. • Producers, such as plants, capture solar energy by a chemical process called photosynthesis. This captured energy then flows through the ecosystem from the producers, to the consumers, and finally to the decomposers. • As matte ...
THE EVOLUTION OF MOUNTAIN RANGES AND THE ORIGIN AND
THE EVOLUTION OF MOUNTAIN RANGES AND THE ORIGIN AND

... Plate Tectonic Theory is an integral part of this subject. In Geology 110 you have learned the basic concepts of plate tectonics, its historical development from continental drift theory, and the basic physical geology needed to understand it. I will not repeat this in this class. Yet that knowledge ...
the thin and solid outermost layer of Earth above the mantle
the thin and solid outermost layer of Earth above the mantle

... Please DO NOT write on Quiz! Bubble in the correct answer on your scantron. 1. Continental Drift is a. the hypothesis that a single large landmass broke up into smaller landmasses to form the continents, which then drifted to their present locations; the movement of continents b. the theory that exp ...
Earth Science Mid Term 2007 Part 1
Earth Science Mid Term 2007 Part 1

... 38. _________ The map above shows three circles used to locate an earthquake epicenter. Five lettered locations, A, B, C, D, and E, are shown as reference points. Epicenter distances from three locations are represented. The earthquake epicenter is located at point A. B. C. D. ...
crust - Edmodo
crust - Edmodo

... TRUE OR FALSE? T 11. Extreme pressure causes the inner core of the Earth to remain solid. T 12. The crust of the Earth is much cooler than its other layers. T 13. The Earth’s mantle is flexible and shifts under heavy loads. ...
Chapter 7 Earth: Our Home in Space
Chapter 7 Earth: Our Home in Space

... •Easiest to study and best understood •Serves as model for other planets – processes within, on, and around planet – properties of planets • Atmosphere: formation, composition, and evolution • Hydrosphere • Solid body – interior structure – surface features: formation and modification • Magnetic fie ...
Go to the following link to start the activity http://www.learner.org
Go to the following link to start the activity http://www.learner.org

... supports our understanding that continents are not fixed and moved over time, but also explains how and why  earthquakes, volcanoes, and other geologic events occur.  What do some scientists predict will happen to our constantly moving tectonic plates in the future? _________________  _____________ ...
Section 2: The Atmosphere - Mrs. Parsiola`s Homepage
Section 2: The Atmosphere - Mrs. Parsiola`s Homepage

... 19. Widespread damage is caused at magnitudes of 7.0 and greater. 20. Where do earthquakes occur and why? The largest and most active earthquake zones lie along tectonic plate boundaries because of the enormous stresses that are generated when tectonic plates separate, collide, or slip past each oth ...
Continental Drift Notes
Continental Drift Notes

... In 1912, a German scientist (he was an explorer, astronomer, and meteorologist proposed that at one time all of the continents had been ______________ to form one huge continent  His name was ________________  He called this supercontinent _______________ (it means “all Earth”)  And, over time (m ...
Volcanoes and Igneous Activity Earth - Chapter 4
Volcanoes and Igneous Activity Earth - Chapter 4

... • Compressional waves (P waves) are able to propagate through liquids as well as solids. © 2011 Pearson Education, Inc. ...
Unit 4 Dynamic Earth: Plate tectonics, mountain building
Unit 4 Dynamic Earth: Plate tectonics, mountain building

... What were the -origin of the characteristics of the earth system early Earth? -origin of life How do scientists think the Earth’s crust and continents formed? How do scientists think the Earth’s atmosphere and oceans formed? What does science tell us about the origin of life? What type of geologic l ...
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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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