Plate Tectonics
... mantle is warmer. It expands, becomes less dense and rises. When it reaches the upper mantle it cools, contracts, becoming more dense and sinks. This constant rise and fall of magma causes the convection currents that drive plate tectonics. The crust plates ride along on top of these convection curr ...
... mantle is warmer. It expands, becomes less dense and rises. When it reaches the upper mantle it cools, contracts, becoming more dense and sinks. This constant rise and fall of magma causes the convection currents that drive plate tectonics. The crust plates ride along on top of these convection curr ...
Document
... subducts underneath the continental lithosphere Oceanic lithosphere heats and dehydrates as it subsides The melt rises forming volcanism E.g. The Andes ...
... subducts underneath the continental lithosphere Oceanic lithosphere heats and dehydrates as it subsides The melt rises forming volcanism E.g. The Andes ...
The Theory of Plate Tectonics
... • Two plates pull apart forming a rift valley in Rift Valley the middle. • Sea-floor spreading is created by a divergent boundary. Mid Ocean Ridge ...
... • Two plates pull apart forming a rift valley in Rift Valley the middle. • Sea-floor spreading is created by a divergent boundary. Mid Ocean Ridge ...
Appalachian Mountain Building
... Instead, the energy associated with the collision is transferred to the crust involved, which becomes highly folded and faulted. ...
... Instead, the energy associated with the collision is transferred to the crust involved, which becomes highly folded and faulted. ...
Plate Tectonics Unit Trivia
... Hot spots can form in the ocean floor, under continents, in the middle of a plate and near plate boundaries. ...
... Hot spots can form in the ocean floor, under continents, in the middle of a plate and near plate boundaries. ...
ALFRED WEGENER AND PANGAEA In 1915, the German geologist
... supercontinent in the southern hemisphere, Eduard Suess's Gondwanaland. This lent further support to A. Wegener's Continental Drift Theory ...
... supercontinent in the southern hemisphere, Eduard Suess's Gondwanaland. This lent further support to A. Wegener's Continental Drift Theory ...
plate driving force
... PLATE MOTIONS CAUSE EARTHQUAKES, VOLCANOS, MOUNTAIN BUILDING AT PLATE BOUNDARIES PLATE TECTONICS MAKES EARTH WHAT IT IS - DIFFERENT FROM ...
... PLATE MOTIONS CAUSE EARTHQUAKES, VOLCANOS, MOUNTAIN BUILDING AT PLATE BOUNDARIES PLATE TECTONICS MAKES EARTH WHAT IT IS - DIFFERENT FROM ...
Ocean waves that wear away an island`s shoreline
... 21. How do constructive forces shape Earth’s surface? Building up mountains 22. What is the layer of Earth’s surface made up mostly of basalt and granite? Crust 23. State the correct order Earth’s of layers (starting from the surface). Crust mantle outer core inner core 24. What is the transfe ...
... 21. How do constructive forces shape Earth’s surface? Building up mountains 22. What is the layer of Earth’s surface made up mostly of basalt and granite? Crust 23. State the correct order Earth’s of layers (starting from the surface). Crust mantle outer core inner core 24. What is the transfe ...
The Sea Floor
... • Pieces of oceanic crust separate mid-ocean ridges by creating cracks called rifts. – Rifts release the pressure on the mantle – Reduced pressure allows hot mantle material to rise up through the rift. ...
... • Pieces of oceanic crust separate mid-ocean ridges by creating cracks called rifts. – Rifts release the pressure on the mantle – Reduced pressure allows hot mantle material to rise up through the rift. ...
Evidence of Plate Tectonics
... • Lithosphere – is broken into plates that ride on the asthenosphere. (rigid mantle and crust) • Asthenosphere – is the “plastic” mantle. (movement mechanism for lithosphere) ...
... • Lithosphere – is broken into plates that ride on the asthenosphere. (rigid mantle and crust) • Asthenosphere – is the “plastic” mantle. (movement mechanism for lithosphere) ...
Wegener—Continental Drift
... B. similar rock layers C. distribution of earthquakes and volcanoes D. the way the continental coastlines fit together like a puzzle ...
... B. similar rock layers C. distribution of earthquakes and volcanoes D. the way the continental coastlines fit together like a puzzle ...
The Dynamic Earth www.mnh.si.edu/earth/ Plate Tectonics and
... Who was Alfred Wegener and why is he important to science? Secrets from the Sea Floor What causes continents to move? Who discovered this? ___________________________ In what year?___________ How did he describe his paper that published his findings? Hess realized that new ____________ _____________ ...
... Who was Alfred Wegener and why is he important to science? Secrets from the Sea Floor What causes continents to move? Who discovered this? ___________________________ In what year?___________ How did he describe his paper that published his findings? Hess realized that new ____________ _____________ ...
Plate tectonics theory
... PBS, Intro to Plate Tectonic Theory, http://www.pbs.org/wgbh/aso/tryit/tectonics/intro.html, accessed ...
... PBS, Intro to Plate Tectonic Theory, http://www.pbs.org/wgbh/aso/tryit/tectonics/intro.html, accessed ...
Plate Tectonics - St John Brebeuf
... asthenosphere that extends down to around 220 kilometers depth. • Temperatures of the asthenosphere are extremely hot, and as a result, the rock is weak ("astheno-" means weak in Greek). • It will be effected by stress and bends in a plastic way. ...
... asthenosphere that extends down to around 220 kilometers depth. • Temperatures of the asthenosphere are extremely hot, and as a result, the rock is weak ("astheno-" means weak in Greek). • It will be effected by stress and bends in a plastic way. ...
esga3092 - 4J Blog Server
... b. where an oceanic plate grinds past a second plate c. where a continental plate grinds past a second plate d. where an oceanic plate moves away from a second plate ...
... b. where an oceanic plate grinds past a second plate c. where a continental plate grinds past a second plate d. where an oceanic plate moves away from a second plate ...
Dynamic Crust
... b) ___________________________________________: Oceanic – Oceanic crust (1) ______________________ bearing minerals, brought down with the suducting plate causes the rock to __________________________. (2) This magma___________________________ through overlying ______________________ and creates dee ...
... b) ___________________________________________: Oceanic – Oceanic crust (1) ______________________ bearing minerals, brought down with the suducting plate causes the rock to __________________________. (2) This magma___________________________ through overlying ______________________ and creates dee ...
Name - www .alexandria .k12 .mn .us
... w/ ____________. 8. Plate Tectonics Theory has been widely accepted since the ___________’s. It states that Earth’s outer layer or _________________ is broken up into ________________. These plates hold ______________________ and _____________________. They are constantly __________________________. ...
... w/ ____________. 8. Plate Tectonics Theory has been widely accepted since the ___________’s. It states that Earth’s outer layer or _________________ is broken up into ________________. These plates hold ______________________ and _____________________. They are constantly __________________________. ...
Plate Tectonics Notes
... a letter from Alfred Wegener’s perspective. Your letter should use evidence (see board) and should try to convince the scientific community that his hypothesis is in fact accurate Include at least 2 pictures on each page of your journal ...
... a letter from Alfred Wegener’s perspective. Your letter should use evidence (see board) and should try to convince the scientific community that his hypothesis is in fact accurate Include at least 2 pictures on each page of your journal ...
Subduction Zone Divergent Plate Boundary
... Alaska - the Alaska Range - Mt. Spur, Mt. Augustine, etc. West coast of Central and South America - Andes Mtns. Western Pacific (oceanic crust on overriding plate) - Phillipines, Japan. ...
... Alaska - the Alaska Range - Mt. Spur, Mt. Augustine, etc. West coast of Central and South America - Andes Mtns. Western Pacific (oceanic crust on overriding plate) - Phillipines, Japan. ...
Erosion
... is made up of 16 enormous plates called tectonic plates. These plates vary in size and shape. ...
... is made up of 16 enormous plates called tectonic plates. These plates vary in size and shape. ...
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.