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Unit 1 Revision
Unit 1 Revision

... • http://www.bbc.co.uk/learningzone/clips/ageological-explanation-ofearthquakes/6736.html • As you watch the clip, write down key words that you hear/read ...
Planet Earth - MSU Billings
Planet Earth - MSU Billings

... • S-wave shadow zone (≥103° from epicenter) suggests outer core is a liquid • Careful observations of P-wave refraction patterns indicate inner core is solid ...
angle of inclination
angle of inclination

... lines tracing the location of the magnetic pole through time for these two continents coincide. Thus, it must be the continents that moved, not the poles! ...
Pacific Ocean - University of Hawaii
Pacific Ocean - University of Hawaii

... Naoto Hirano at the Tokyo Institute of Technology, Japan, and colleagues have discovered miniature volcanoes – between 0.005 cubic kilometres and 1 km3 in size – near the underwater Japan Trench. These volcanoes, dubbed “petit spot” because of their size, cannot be accounted for by any of the conven ...
Plate Tectonics II
Plate Tectonics II

... The Grand Canyon catches the eye for its tremendous depth, but the North Rim is also over 8000 feet (2400 m) above sea level! Note how FLAT the upland surface is! ...
Structure of the upper mantle beneath the Alps and Apennines as
Structure of the upper mantle beneath the Alps and Apennines as

... broad zone of deformation, due to the convergence between the two plates (DeMets et al., 1990 and DeMets et al., 1994). Since late Cretaceous the Adriatic microplate, acting as a promontory of Africa, has deeply indented Europe, resulting in yielding the Alpine orogeny (P ...
Continental Drift - Ashland Independent Schools
Continental Drift - Ashland Independent Schools

... drift apart. His theory was that the continents plowed through the ocean floor and were driven by the spin of the Earth. ...
USGS - Developing the Theory Continental drift was hotly debated
USGS - Developing the Theory Continental drift was hotly debated

... The discovery of magnetic striping naturally prompted more questions: How does the magnetic striping pattern form? And why are the stripes symmetrical around the crests of the mid-ocean ridges? These questions could not be answered without also knowing the significance of these ridges. In 1961, scie ...
Lecture Test 2 Spring 2013 - Tarleton State University
Lecture Test 2 Spring 2013 - Tarleton State University

... 36. The study of fossil tracks, trails and burrows is A.taxonomy B.systematics C.phylogeny D.ontogeny E.ichnology 37. Triple rift systems occur along ? plate boundaries. A.transform B.convergent C.divergent 38. The total disappearance of a taxon is termed A.an adaptive radiation B.extinction C.phylo ...
LESSON 5 - PANGEA STAGE ONE: Lesson is designed to be taught
LESSON 5 - PANGEA STAGE ONE: Lesson is designed to be taught

... done before?) Students will have learned about the properties This lesson will be followed by the first in a of the mantle and crust during previous series of lectures on plate tectonics. lectures. Anticipated student strengths/obstacles/difficulties Strengths – Students will have knowledge about th ...
Restless Earth Revision Paper 1
Restless Earth Revision Paper 1

... Constructive Plate Margin What happens? The oceanic plates move apart. As the plates move apart (very slowly), magma rises from the mantle. The magma erupts to the surface of the ...
Sea-Floor Spreading
Sea-Floor Spreading

... Diagram of Sea-Floor Spreading: ...
lava
lava

... As these plates float, they move in three different ways. Each way that they move has a special name associated with the boundary ...
Mid-Ocean Ridges
Mid-Ocean Ridges

... • Underwater mountain system formed by plate tectonics. • Oceanic spreading center – Valley of rifts running along its spine – Responsible for seafloor spreading ...
EGU2016-4818
EGU2016-4818

... turbulent mixing, coupling to a parameterized core heat balance and a radiative surface boundary condition. These enhancements have been made to the numerical code StagYY (Tackley, PEPI 2008). We present results for the evolution of an Earth-like planet from a molten initial state to present day, wh ...
Unit 1A Assessment Review
Unit 1A Assessment Review

... 4. How does the age of the sea floor show that the tectonic plates move? 5. What causes plate tectonic to move? Describe your answer. 6. What evidence did Alfred Wegener not use to support his theory of continental drift? 7. Describe three types of boundaries. 8. Explain how records of magnetic reve ...
GE1632013UFINALEXAM
GE1632013UFINALEXAM

... Rocks in this region of the Earth deform by brittle fracture lithosphere asthenosphere mantle low-velocity zone ...
Exercise II - Earthquakes, volcanoes and tectonics
Exercise II - Earthquakes, volcanoes and tectonics

... (http://earthquake.usgs.gov/), do the following: A) On the attached table, record the date, location (in latitude and longitude), magnitude, and depth of 10 recent (past week) earthquakes from various locations around the globe (3pts); B) Plot and label the locations of these earthquakes on the plat ...
EARTHQUAKES & VOLCANOES
EARTHQUAKES & VOLCANOES

... slow conveyor belt. The speed of this motion is a few centimeters per year, about as fast as your fingernails grow. The new lithosphere, created at the ocean spreading centers, cools as it ages and eventually becomes dense enough to sink back into the mantle. The subducted crust releases water to fo ...
Earth`s Interior
Earth`s Interior

... 11. Complete the cause, events, and effect graphic organizer to show the relationships among the processes of convection currents, subduction, and sea-floor spreading. a. ...
Mapping the Ocean Floor
Mapping the Ocean Floor

...  The slope of the ocean floor becomes much steeper, typically a 4° slope, or 70 meters per kilometer.  is grooved by submarine canyons and ...
A1980JF47100001
A1980JF47100001

... work. Then Maurice took the newlycommissioned RRS Discovery out in the summer of 1963 for more detailed experiments. Maurice felt very strongly that though geophysical experiments were elegant and informative, it was important to find out something about the rocks on which the measurements were bein ...
Name_____________ Plate tectonics review 1 State the latitude
Name_____________ Plate tectonics review 1 State the latitude

... bedrock geology of Iceland, an island located on the Mid-Atlantic Ridge. Points A, B, C, and D are locations on surface bedrock which is igneous in origin. Glaciers cover some surface bedrock. ...
EARTH`S LAYERS
EARTH`S LAYERS

... solid, topmost part of the earth; 50 – 100 km thick and broken up into large sections called lithospheric plates; there are at least 7 major plates ...
Farallon And Kula Plates David Reed
Farallon And Kula Plates David Reed

... Off of the Pacific Coast of North American lie the remnants of old tectonic plates. They current go by the name of the Cocos Plate (currently located in Central America) and the Juan De Fuca Plate (located near the Oregon and Washington coast). Connecting these old subsiding plates is the San Andrea ...
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Plate tectonics



Plate tectonics (from the Late Latin tectonicus, from the Greek: τεκτονικός ""pertaining to building"") is a scientific theory that describes the large-scale motion of Earth's lithosphere. This theoretical model builds on the concept of continental drift which was developed during the first few decades of the 20th century. The geoscientific community accepted the theory after the concepts of seafloor spreading were later developed in the late 1950s and early 1960s.The lithosphere, which is the rigid outermost shell of a planet (on Earth, the crust and upper mantle), is broken up into tectonic plates. On Earth, there are seven or eight major plates (depending on how they are defined) and many minor plates. Where plates meet, their relative motion determines the type of boundary; convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along these plate boundaries. The lateral relative movement of the plates typically varies from zero to 100 mm annually.Tectonic plates are composed of oceanic lithosphere and thicker continental lithosphere, each topped by its own kind of crust. Along convergent boundaries, subduction carries plates into the mantle; the material lost is roughly balanced by the formation of new (oceanic) crust along divergent margins by seafloor spreading. In this way, the total surface of the globe remains the same. This prediction of plate tectonics is also referred to as the conveyor belt principle. Earlier theories (that still have some supporters) propose gradual shrinking (contraction) or gradual expansion of the globe.Tectonic plates are able to move because the Earth's lithosphere has greater strength than the underlying asthenosphere. Lateral density variations in the mantle result in convection. Plate movement is thought to be driven by a combination of the motion of the seafloor away from the spreading ridge (due to variations in topography and density of the crust, which result in differences in gravitational forces) and drag, with downward suction, at the subduction zones. Another explanation lies in the different forces generated by the rotation of the globe and the tidal forces of the Sun and Moon. The relative importance of each of these factors and their relationship to each other is unclear, and still the subject of much debate.
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