chapter 15A - plate tectonics 1
... Continental-continental convergence • When converging plates contain continental material at their respective boundaries, subduction cannot occur, as the plates are too buoyant to sink. • The continents collide, causing the crust to shorten and thicken • This process produces high-elevation, non-vo ...
... Continental-continental convergence • When converging plates contain continental material at their respective boundaries, subduction cannot occur, as the plates are too buoyant to sink. • The continents collide, causing the crust to shorten and thicken • This process produces high-elevation, non-vo ...
Alfred Wegener was a scientist who lived about 100 years ago
... After Alfred Wegener died, new technologies were invented that led to new discoveries which led to the modern theory of plate tectonics. One new technology, sonar, allowed scientists to make a map of the ocean floor. Scientists discovered a long, underwater system of cracks on the sea-floor called m ...
... After Alfred Wegener died, new technologies were invented that led to new discoveries which led to the modern theory of plate tectonics. One new technology, sonar, allowed scientists to make a map of the ocean floor. Scientists discovered a long, underwater system of cracks on the sea-floor called m ...
Continental Drift
... – PLATE TECTONICS – surface of earth composed of “plates” (LITHOSPHERE) that move on a “conveyor belt” (ASTHENOSPHERE) ...
... – PLATE TECTONICS – surface of earth composed of “plates” (LITHOSPHERE) that move on a “conveyor belt” (ASTHENOSPHERE) ...
Plate Tectonics - hrsbstaff.ednet.ns.ca
... well as earthquakes. • Continental plates are folded into mountains. ...
... well as earthquakes. • Continental plates are folded into mountains. ...
Section 4 Sea-Floor Spreading
... has only a few short trenches. As a result, the spreading ocean floor pushes the continents further away from each other. Over time, the whole ocean gets wider. ...
... has only a few short trenches. As a result, the spreading ocean floor pushes the continents further away from each other. Over time, the whole ocean gets wider. ...
REINFORCEMENT
... the upper mantle. 3. The crust and upper mantle are called the ______________ 4. Beneath this layer is the plasticlike _ _ _ _ _ _ _ _ _ _ _ __ 5. Many scientists think hot plasticlike rock is forced upward toward the surface, cools, and sinks. This process is called a ______________ Four diagram ...
... the upper mantle. 3. The crust and upper mantle are called the ______________ 4. Beneath this layer is the plasticlike _ _ _ _ _ _ _ _ _ _ _ __ 5. Many scientists think hot plasticlike rock is forced upward toward the surface, cools, and sinks. This process is called a ______________ Four diagram ...
learning targets for
... What are the LAYERS OF THE EARTH? Give the thickness of each layer and its composition. Include Asthenosphere and Lithosphere. THE LAYERS OF THE EARTH. Create a visual display that shows the layers of the earth, in proportion to their actual thickness, labeling each with their correct thickness and ...
... What are the LAYERS OF THE EARTH? Give the thickness of each layer and its composition. Include Asthenosphere and Lithosphere. THE LAYERS OF THE EARTH. Create a visual display that shows the layers of the earth, in proportion to their actual thickness, labeling each with their correct thickness and ...
Rocks - Images
... Transform Fault Boundaries • 2 plates slide past each other horizontally • Do not produce magma • Fracture zones at mid-ocean ridges are transform fault zones ...
... Transform Fault Boundaries • 2 plates slide past each other horizontally • Do not produce magma • Fracture zones at mid-ocean ridges are transform fault zones ...
Plate Tectonics and Continental Drift
... ____ 6. The lithosphere consists of two parts, which are the crust and the upper mantle. ____ 7. As distance increases from a mid-ocean ridge, the rocks are older. Where is the youngest oceanic crust located? At the mid ocean ridges, where the two plates move a apart, or diverge. ____ 8. Most earthq ...
... ____ 6. The lithosphere consists of two parts, which are the crust and the upper mantle. ____ 7. As distance increases from a mid-ocean ridge, the rocks are older. Where is the youngest oceanic crust located? At the mid ocean ridges, where the two plates move a apart, or diverge. ____ 8. Most earthq ...
Chp 12.1- Evidence for Continental Drift
... • Magma (melted rock) rises and falls like warm and cold liquids. • The convection currents of magma formed a SPREADING RIDGE where they broke through Earth’s crust. • Like a “new crust” CONVEYER BELT • Magnetic striping of basalt rock shows long stripes of new rock moving away from ocean ridges and ...
... • Magma (melted rock) rises and falls like warm and cold liquids. • The convection currents of magma formed a SPREADING RIDGE where they broke through Earth’s crust. • Like a “new crust” CONVEYER BELT • Magnetic striping of basalt rock shows long stripes of new rock moving away from ocean ridges and ...
idea proposed by Alfred Wegener that the continents started as one
... Plate boundaries Divergent: when plates of lithosphere move apart. o Builds oceans Convergent: when plates of lithosphere move together. o Ophioltes: sections of the oceantic crust that are uplifted and exposed within the continental crust. o Subduction: one plate moves below another plate. Resul ...
... Plate boundaries Divergent: when plates of lithosphere move apart. o Builds oceans Convergent: when plates of lithosphere move together. o Ophioltes: sections of the oceantic crust that are uplifted and exposed within the continental crust. o Subduction: one plate moves below another plate. Resul ...
Unit 3: Plate Tectonics: Test Review
... 11.What are convection currents? A Cycle of heating, rising, cooling, and sinking due to DENSITY in the mantle which is thought to be the force behind plate tectonics. 12. Is hot water more or less dense than cold water? Less dense 13. What causes magma to rise to the surface? Heat and Density. 14. ...
... 11.What are convection currents? A Cycle of heating, rising, cooling, and sinking due to DENSITY in the mantle which is thought to be the force behind plate tectonics. 12. Is hot water more or less dense than cold water? Less dense 13. What causes magma to rise to the surface? Heat and Density. 14. ...
Video Study Guide: Earth Revealed
... Give real-world examples of the different types of plate boundaries: Divergent: Ocean/ocean convergent: Ocean/continental convergent: Continental/continental convergent: ...
... Give real-world examples of the different types of plate boundaries: Divergent: Ocean/ocean convergent: Ocean/continental convergent: Continental/continental convergent: ...
Powerpoint presentation for Lecture 3 - e
... magnetic moment when they are cooled below the Curie Temperature ...
... magnetic moment when they are cooled below the Curie Temperature ...
Plate Tectonics - Mrs. DiLorenzo Earth Science
... Key Characteristics: subduction, trenches, volcanoes, deep earthquakes Example: Peru-Chile Trench ...
... Key Characteristics: subduction, trenches, volcanoes, deep earthquakes Example: Peru-Chile Trench ...
8.1 Earth has several layers
... • Tectonic plates rest on the asthenosphere (layer of soft, hot rock) • Convection currents within Earth helps to move the plates • convection—the transfer of heat by the movement of a material • convection current—a motion that transfers heat energy to a material • Moves very slowly, a few centimet ...
... • Tectonic plates rest on the asthenosphere (layer of soft, hot rock) • Convection currents within Earth helps to move the plates • convection—the transfer of heat by the movement of a material • convection current—a motion that transfers heat energy to a material • Moves very slowly, a few centimet ...
Plate Tectonics 07ppt
... Plates move towards each other Volcanic activity common Deep, medium and shallow earthquakes Three types; Ocean to ocean Ocean to continent Continent to continent ...
... Plates move towards each other Volcanic activity common Deep, medium and shallow earthquakes Three types; Ocean to ocean Ocean to continent Continent to continent ...
Intro to Continenial Drift
... Mechanisms of Plate Motion Causes of Plate Motion Mantle Convection • Mantle plumes are masses of hotter-thannormal mantle material that ascend toward the surface, where they may lead to igneous activity. • The unequal distribution of heat within Earth causes the thermal convection in the mantle ...
... Mechanisms of Plate Motion Causes of Plate Motion Mantle Convection • Mantle plumes are masses of hotter-thannormal mantle material that ascend toward the surface, where they may lead to igneous activity. • The unequal distribution of heat within Earth causes the thermal convection in the mantle ...
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.