Earthquakes: Tremors from Below – What Causes the Earth to Shake?
... edges of tectonic plates, the big pieces of Earth’s crust that make up its outer shell. These plates fit together like a puzzle, but they are always moving very slowly, about one or two inches per year. Where the edges of the plates meet, three things can happen. Plates can collide, separate, or ...
... edges of tectonic plates, the big pieces of Earth’s crust that make up its outer shell. These plates fit together like a puzzle, but they are always moving very slowly, about one or two inches per year. Where the edges of the plates meet, three things can happen. Plates can collide, separate, or ...
Plate Boundaries-new
... Presentation Objectives: § Define the theory of plate tectonics. § Explain how the Earth is divided into layers based on chemical and physical properties. § Define the asthenosphere and lithosphere. § Describe the plate motion at each of the three different plate boundaries. § Describe the feat ...
... Presentation Objectives: § Define the theory of plate tectonics. § Explain how the Earth is divided into layers based on chemical and physical properties. § Define the asthenosphere and lithosphere. § Describe the plate motion at each of the three different plate boundaries. § Describe the feat ...
plate-tectonics-pre-test-study-guide
... ______ 9. Each cycle of spreading and intrusion of magma during seafloor spreading results in _____ a. magnetic reversals b. new ocean crust c. subduction d. plates colliding ______ 10. Features found at divergent boundaries include _____ a. ocean ridges b. deep-sea trenches c. crumpled mountains d. ...
... ______ 9. Each cycle of spreading and intrusion of magma during seafloor spreading results in _____ a. magnetic reversals b. new ocean crust c. subduction d. plates colliding ______ 10. Features found at divergent boundaries include _____ a. ocean ridges b. deep-sea trenches c. crumpled mountains d. ...
Powerpoint
... Abyssal Plain – deep sea floor 3,000-5,000 meters Contains seamounts - underwater volcanoes with a pointy top Contains guyots (tablemounts) - flat topped seamounts that were once volcanic islands that eroded and sunk. Trenches – where the ocean plate descends into the continental plate. (subduction ...
... Abyssal Plain – deep sea floor 3,000-5,000 meters Contains seamounts - underwater volcanoes with a pointy top Contains guyots (tablemounts) - flat topped seamounts that were once volcanic islands that eroded and sunk. Trenches – where the ocean plate descends into the continental plate. (subduction ...
Geology - s3.amazonaws.com
... • Movement of ~20 huge slabs called, “tectonic plates” – Forms the shape of our continents – Creates mountains – Cause volcanoes to erupt ...
... • Movement of ~20 huge slabs called, “tectonic plates” – Forms the shape of our continents – Creates mountains – Cause volcanoes to erupt ...
Chapter One
... 2) Fern-like fossils have been found in Africa, South America, Australia, India, Antarctica 3) Continents were exposed to different climates. (Example: deep scratches in rock showed that glaciers once covered South Africa. South Africa was closer to the South Pole. ...
... 2) Fern-like fossils have been found in Africa, South America, Australia, India, Antarctica 3) Continents were exposed to different climates. (Example: deep scratches in rock showed that glaciers once covered South Africa. South Africa was closer to the South Pole. ...
Divergent Boundaries: Origin and Evolution of the
... •Oceanic lithosphere subducts because its overall density is greater than the underlying mantle •Subduction of older, colder lithosphere results in descending angles of nearly 90º •Younger, warmer oceanic lithosphere is more buoyant and angles of descent are small •The lithospheric slab moves horizo ...
... •Oceanic lithosphere subducts because its overall density is greater than the underlying mantle •Subduction of older, colder lithosphere results in descending angles of nearly 90º •Younger, warmer oceanic lithosphere is more buoyant and angles of descent are small •The lithospheric slab moves horizo ...
Chapter 7
... Asthenosphere = partially molten part of upper mantle, below lithosphere. Rigid lithospheric plates "float" on flowing asthenosphere. Convection in asthenosphere moves tectonic plates. ...
... Asthenosphere = partially molten part of upper mantle, below lithosphere. Rigid lithospheric plates "float" on flowing asthenosphere. Convection in asthenosphere moves tectonic plates. ...
Movements of the Earth
... continents may have once been joined together in a large super-continent, and had since drifted to their present positions. ...
... continents may have once been joined together in a large super-continent, and had since drifted to their present positions. ...
Describe the differences and relation between the lithosphere and asthenosphere.
... Two oceanic crusts Oceanic crust subducts under opposing oceanic crust Oldest oceanic crust subducts ...
... Two oceanic crusts Oceanic crust subducts under opposing oceanic crust Oldest oceanic crust subducts ...
Chapters 1(review)
... What is a passive continental margin? Where is there a passive continental margin today? ...
... What is a passive continental margin? Where is there a passive continental margin today? ...
Homework 5: Buoyancy Introduction The buoyancy of plates is a
... Typed responses are preferred. 1. Oceanic plates start out very thin, with almost no mantle attached to them. The plates then increase in thickness as times goes by adding more and more mantle material to the base of the plate. This addition of material suggests that plate buoyancy will decrease thr ...
... Typed responses are preferred. 1. Oceanic plates start out very thin, with almost no mantle attached to them. The plates then increase in thickness as times goes by adding more and more mantle material to the base of the plate. This addition of material suggests that plate buoyancy will decrease thr ...
1 plate tectonics - IES Gabriela Mistral
... oLANDFORMS. Maps of the ocean have been created using sonar. Sonar (Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater) to navigate, communicate with or detect objects on or under the surface of the water. Active sonar is emitting pulses of sounds and listen ...
... oLANDFORMS. Maps of the ocean have been created using sonar. Sonar (Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater) to navigate, communicate with or detect objects on or under the surface of the water. Active sonar is emitting pulses of sounds and listen ...
Click here for the "PHET Simulation - Plate
... From the water cycle to the rock cycle, much of the Earth is always in motion. Much like a puzzle, the Earth is composed of numerous tectonic plates, each of which moves in a unique direction at unique rates. Throughout this activity, explore plate tectonics, the different layers of the Earth, and i ...
... From the water cycle to the rock cycle, much of the Earth is always in motion. Much like a puzzle, the Earth is composed of numerous tectonic plates, each of which moves in a unique direction at unique rates. Throughout this activity, explore plate tectonics, the different layers of the Earth, and i ...
What’s inside the Earth? Is there really another world at
... continental crust, so it sits lower than continental crust. – Composed of basalt (volcanic). ...
... continental crust, so it sits lower than continental crust. – Composed of basalt (volcanic). ...
Land, Water, and Air
... • Includes the crust, mantle, and core • The crust and top layer of mantle are divided into huge, irregular-shaped slabs of rock called plates ...
... • Includes the crust, mantle, and core • The crust and top layer of mantle are divided into huge, irregular-shaped slabs of rock called plates ...
Review sheet – Chapter 3 Understand that the Earth is density
... Know that oceanic crust ages as it spreads outward from the spreading center (towards the continents); the oldest oceanic crust would therefore be closer to the continents, and the newest would be at or near the spreading center (mid-ocean ridge) Know that the rate of seafloor spreading is ~2-12cm p ...
... Know that oceanic crust ages as it spreads outward from the spreading center (towards the continents); the oldest oceanic crust would therefore be closer to the continents, and the newest would be at or near the spreading center (mid-ocean ridge) Know that the rate of seafloor spreading is ~2-12cm p ...
PLATE TECTONICS REVIEW
... Unit LEQ: How has the Earth’s surface changed throughout its history? What caused these changes and what role did it play in macroevolution? Section 1: Structure of the Earth Vocabulary ...
... Unit LEQ: How has the Earth’s surface changed throughout its history? What caused these changes and what role did it play in macroevolution? Section 1: Structure of the Earth Vocabulary ...
Plate tectonics
... 2. What is lithosphere, asthenosphere? 3. Describe the fundamental observations that led to PT 4. Continents in motion 5.The oceanic crust and lithosphere 6.Transform faults 7. Convergent margins, subduction and collision ...
... 2. What is lithosphere, asthenosphere? 3. Describe the fundamental observations that led to PT 4. Continents in motion 5.The oceanic crust and lithosphere 6.Transform faults 7. Convergent margins, subduction and collision ...
Chapter 4 Assignment GEarthOL
... chapter and completed checkpoint 4.13 (above). FOR EXAMPLE (many students struggle with this question but it’s important to understand these patterns): number 4 above is patterns of volcanic activity: so think about this, where are volcanoes generally located? Are they found at divergent boundaries? ...
... chapter and completed checkpoint 4.13 (above). FOR EXAMPLE (many students struggle with this question but it’s important to understand these patterns): number 4 above is patterns of volcanic activity: so think about this, where are volcanoes generally located? Are they found at divergent boundaries? ...
2PlateTectonicsPowerPoint4
... • The Theory of Plate Tectonics evolved it was built on Alfred Wegener’s ideas about Continental Drift. ...
... • The Theory of Plate Tectonics evolved it was built on Alfred Wegener’s ideas about Continental Drift. ...
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.