Oceanic Crust
... • The subducting plate is bent downward to form a very deep depression in the ocean floor called a trench. • The worlds deepest parts of the ocean are found along ...
... • The subducting plate is bent downward to form a very deep depression in the ocean floor called a trench. • The worlds deepest parts of the ocean are found along ...
Earth Shaping
... Hot rock rises while cool rock sinks Causes the lithosphere to move sideways ...
... Hot rock rises while cool rock sinks Causes the lithosphere to move sideways ...
Chapter 17- Plate Tectonics
... • Seafloor spreading- new ocean crust is formed at ocean ridges and destroyed at deep sea trenches – Magma forced toward crust – Fills gaps and hardens – Forms new ocean floor ...
... • Seafloor spreading- new ocean crust is formed at ocean ridges and destroyed at deep sea trenches – Magma forced toward crust – Fills gaps and hardens – Forms new ocean floor ...
Lithosphere Part 2
... • May also rise in mantle plumes directly from the outer core/mantle boundary. ...
... • May also rise in mantle plumes directly from the outer core/mantle boundary. ...
Chapter 4 – Plate Tectonics
... been found in Antarctica, India and South Africa because these areas were once connected to each other. o Plate movement measured in centimeters per year ...
... been found in Antarctica, India and South Africa because these areas were once connected to each other. o Plate movement measured in centimeters per year ...
Chapter 9: Plate Tectonics Review
... • Geological theory that states that pieces of Earth's lithosphere are in constant, slow motion ...
... • Geological theory that states that pieces of Earth's lithosphere are in constant, slow motion ...
Unit 11: Plate Tectonics
... 2. Oceanic ridge – seafloor that is elevated along well developed divergent boundaries 3. Rift valleys – deep faulted structures found along the axes of some segments 4. Seafloor spreading – The process in which the ocean floor is extended when two plates move apart, forming a crack where magma can ...
... 2. Oceanic ridge – seafloor that is elevated along well developed divergent boundaries 3. Rift valleys – deep faulted structures found along the axes of some segments 4. Seafloor spreading – The process in which the ocean floor is extended when two plates move apart, forming a crack where magma can ...
Chapter 12 Plate Tectonics
... a. Has trenches b. Plates come together c. Collision causes tremendous pressure and friction ...
... a. Has trenches b. Plates come together c. Collision causes tremendous pressure and friction ...
Earth`s Plates in Motion - Etiwanda E
... • Rock formations, climate similarities, and plant & animal species gave further evidence. ...
... • Rock formations, climate similarities, and plant & animal species gave further evidence. ...
Get out your pieces for Tectonicland Have your HOMEWORK out
... Who was the first person to propose that the continents once fit together? ii. What was one of Wegener’s forms of evidence for continental drift? iii. What were the two flaws of Wegener’s continental drift hypothesis? ...
... Who was the first person to propose that the continents once fit together? ii. What was one of Wegener’s forms of evidence for continental drift? iii. What were the two flaws of Wegener’s continental drift hypothesis? ...
Convection in the Mantle and The Theory of Plate Tectonics
... (often called a collision). • When two plates collide, the density of the plate determines which one comes out on top. ...
... (often called a collision). • When two plates collide, the density of the plate determines which one comes out on top. ...
Plate Movement Power Point
... lithosphere is divided into tectonic plates that move on top of asthenosphere ...
... lithosphere is divided into tectonic plates that move on top of asthenosphere ...
Plate Tectonics - Duplin County Schools
... More dense ocean crust subducted beneath less dense continental crust forming an oceanic trench ...
... More dense ocean crust subducted beneath less dense continental crust forming an oceanic trench ...
Section Quiz - TheVirtualNeal
... zone, the lithosphere is denser than it is at a mid-ocean ridge. Convection causes oceanic lithosphere to move away from the mid ocean ridge. Oceanic lithosphere is also higher at a mid-ocean ridge, so oceanic lithosphere moves down toward the subduction zone because of gravity. Answers will vary. T ...
... zone, the lithosphere is denser than it is at a mid-ocean ridge. Convection causes oceanic lithosphere to move away from the mid ocean ridge. Oceanic lithosphere is also higher at a mid-ocean ridge, so oceanic lithosphere moves down toward the subduction zone because of gravity. Answers will vary. T ...
Plate Tectonics - Crafton Hills College
... 6) Polar Wandering: ancient poles were in different positions than the present poles. This can only be explained by: 1) Continents remained still and the poles moved 2) Poles were still and the continents moved (Reality: they both move) Wagener’s theory was not accepted. Why? ...
... 6) Polar Wandering: ancient poles were in different positions than the present poles. This can only be explained by: 1) Continents remained still and the poles moved 2) Poles were still and the continents moved (Reality: they both move) Wagener’s theory was not accepted. Why? ...
Plate Tectonics - Crafton Hills College
... 6) Polar Wandering: ancient poles were in different positions than the present poles. This can only be explained by: 1) Continents remained still and the poles moved 2) Poles were still and the continents moved (Reality: they both move) Wagener’s theory was not accepted. Why? ...
... 6) Polar Wandering: ancient poles were in different positions than the present poles. This can only be explained by: 1) Continents remained still and the poles moved 2) Poles were still and the continents moved (Reality: they both move) Wagener’s theory was not accepted. Why? ...
Plate Tectonics
... • Earth’s crust and upper mantle are broken into sections called plates, they move on a plastic-like layer of the mantle. • Plates and upper mantle form the lithosphere. • Plastic-like layer below is called asthenosphere. ...
... • Earth’s crust and upper mantle are broken into sections called plates, they move on a plastic-like layer of the mantle. • Plates and upper mantle form the lithosphere. • Plastic-like layer below is called asthenosphere. ...
1. 1. Draw a subduction zone in which an oceanic plate collides with
... of seismicity (if any), location of volcanism (if any). Draw the boundary between the crust and the mantle and the boundary between the lithosphere and the asthenosphere. Draw arrows to show the direction of motion of each of the two plates. Here’s how to make your drawing: go to http://www.imaginat ...
... of seismicity (if any), location of volcanism (if any). Draw the boundary between the crust and the mantle and the boundary between the lithosphere and the asthenosphere. Draw arrows to show the direction of motion of each of the two plates. Here’s how to make your drawing: go to http://www.imaginat ...
Chapter 10 Section 3
... mantle that transfers heat in Earth's interior and is the driving force for plate tectonics. It is also known as the cycle of heating, rising, and cooling. ...
... mantle that transfers heat in Earth's interior and is the driving force for plate tectonics. It is also known as the cycle of heating, rising, and cooling. ...
Plate Tectonics
... A New Theory Emerges Wegener could not provide an ________________________ of exactly what made the continents move. New ____________________________ lead to findings which then lead to a _____________________ called __________________________________ This New Evidence… With new technologies, ...
... A New Theory Emerges Wegener could not provide an ________________________ of exactly what made the continents move. New ____________________________ lead to findings which then lead to a _____________________ called __________________________________ This New Evidence… With new technologies, ...
Plate Tectonics - Earth and Environmental Sciences
... Plates are constructed by volcanism at divergent margins Plates slide past each other along transform margins Oceanic plates cool, becoming heavier, and sink at convergent margins. Important Question: Are continents new or old? ...
... Plates are constructed by volcanism at divergent margins Plates slide past each other along transform margins Oceanic plates cool, becoming heavier, and sink at convergent margins. Important Question: Are continents new or old? ...
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.