Evidence of Seafloor Spreading
... the thinking of geologist everywhere. One of them, Harry Hess, was a factor in figuring out how plate tectonics worked. In 1960, Harry Hess studied Wegner's theory. In 1962, as a result of oceanographic research conducted in the 1950’s Harry Hess proposed the theory of seafloor spreading to account ...
... the thinking of geologist everywhere. One of them, Harry Hess, was a factor in figuring out how plate tectonics worked. In 1960, Harry Hess studied Wegner's theory. In 1962, as a result of oceanographic research conducted in the 1950’s Harry Hess proposed the theory of seafloor spreading to account ...
Plate Tectonics
... • The boundary between two plates that are moving apart is called a divergent boundary • In the Atlantic Ocean, the North American Plate is moving away from the Eurasian and the African Plate – The divergent boundary is called the MidAtlantic Ridge ...
... • The boundary between two plates that are moving apart is called a divergent boundary • In the Atlantic Ocean, the North American Plate is moving away from the Eurasian and the African Plate – The divergent boundary is called the MidAtlantic Ridge ...
Ch. 9 Plate Tectonics: Study Guide
... 19. Applying Concepts Some people predict that California will sink into the ocean. Does this idea fit with the theory of plate tectonics? Explain. ...
... 19. Applying Concepts Some people predict that California will sink into the ocean. Does this idea fit with the theory of plate tectonics? Explain. ...
Continental Drift and Plate Tectonics
... Did you know that the Earth’s longest mountain range is underwater and is called the mid-ocean ridge? The Mid-Ocean Ridge system, shown above snaking its way between the continents, is more than 56,000 kilometers (35,000 mi) long. It circles the earth like the stitching on a baseball! ...
... Did you know that the Earth’s longest mountain range is underwater and is called the mid-ocean ridge? The Mid-Ocean Ridge system, shown above snaking its way between the continents, is more than 56,000 kilometers (35,000 mi) long. It circles the earth like the stitching on a baseball! ...
CD vs. PT
... Did you know that the Earth’s longest mountain range is underwater and is called the mid-ocean ridge? The Mid-Ocean Ridge system, shown above snaking its way between the continents, is more than 56,000 kilometers (35,000 mi) long. It circles the earth like the stitching on a baseball! ...
... Did you know that the Earth’s longest mountain range is underwater and is called the mid-ocean ridge? The Mid-Ocean Ridge system, shown above snaking its way between the continents, is more than 56,000 kilometers (35,000 mi) long. It circles the earth like the stitching on a baseball! ...
Plate Tectonics and Continental Drift
... floor is constantly spreading along the MidAtlantic Ridge. ...
... floor is constantly spreading along the MidAtlantic Ridge. ...
Slide 1
... What is the main cause of plate movement? Convection currents How do convection currents work? Core heats up molten rock making it less dense. The molten rock rises up towards the crust, where it cools down. As it cools it gets more dense and begins to sink back down through the mantle. This cycle w ...
... What is the main cause of plate movement? Convection currents How do convection currents work? Core heats up molten rock making it less dense. The molten rock rises up towards the crust, where it cools down. As it cools it gets more dense and begins to sink back down through the mantle. This cycle w ...
Plates of the Lithosphere - Cal State LA
... • Compressional forces result in plates colliding with ...
... • Compressional forces result in plates colliding with ...
Unit 1 – Studying the Earth Topics
... 11. Scientists use the terms “crust, mantle and core” as well as “lithosphere and asthenosphere.” What is the difference between these layers? 12. Which is more dense, continental crust or oceanic crust? 13. Tectonic plates are also indicated by what two geologic features? Types of Plate Boundaries ...
... 11. Scientists use the terms “crust, mantle and core” as well as “lithosphere and asthenosphere.” What is the difference between these layers? 12. Which is more dense, continental crust or oceanic crust? 13. Tectonic plates are also indicated by what two geologic features? Types of Plate Boundaries ...
Plate Tectonics - Fort Thomas Independent Schools
... floor sinks back into the mantle through deep-ocean trenches. Deep-ocean trenches are deep underwater canyons formed where the oceanic crust bends downward. ...
... floor sinks back into the mantle through deep-ocean trenches. Deep-ocean trenches are deep underwater canyons formed where the oceanic crust bends downward. ...
5. The Theory of plate tectonics
... plates move away from each other, new oceanic crust appears forming mid-ocean ridges with volcanoes ...
... plates move away from each other, new oceanic crust appears forming mid-ocean ridges with volcanoes ...
Plate Tectonics
... – Lithosphere (solid crust and upper mantle) is broken into plates. – Tectonic Plate- A large, solid piece of the earth’s crust that includes the continents and ocean floor. – These plates float or ride on the asthenosphere. ...
... – Lithosphere (solid crust and upper mantle) is broken into plates. – Tectonic Plate- A large, solid piece of the earth’s crust that includes the continents and ocean floor. – These plates float or ride on the asthenosphere. ...
A Head
... The fossils on some continents show that their climate must have been very different in the past. ...
... The fossils on some continents show that their climate must have been very different in the past. ...
Continental Drift - The Cyberworld of Deepsea Dawn, Oregon
... – 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) ...
Earth`s Structure notes 5/26/15 • Crust
... – There is a huge difference in temperature between the outer mantle and the inner mantle. – This difference in temperature sets up a convection current which is responsible for the cracking and moving of the tectonic plates. • Outer Core- liquid layer directly below the mantle (Fe, Ni) • Inner Core ...
... – There is a huge difference in temperature between the outer mantle and the inner mantle. – This difference in temperature sets up a convection current which is responsible for the cracking and moving of the tectonic plates. • Outer Core- liquid layer directly below the mantle (Fe, Ni) • Inner Core ...
Chapter 4 Lesson 1 Plate Tectonics
... features of the same age restore to a tight polar distribution. ...
... features of the same age restore to a tight polar distribution. ...
Earth`s Interior
... continents DUE to plate tectonics Continents are NOT the same as plates Tectonic plates can be made up of both oceanic crust and continental crust Continental ...
... continents DUE to plate tectonics Continents are NOT the same as plates Tectonic plates can be made up of both oceanic crust and continental crust Continental ...
Layers of the Earth Exit Slip Key
... 3. By which method is heat from deep in Earth's interior transferred to its crust? a. Conduction in the ocean b. Convection in the mantle c. Radiation from the solid core d. Evaporation at mid-ocean ridges © Copyright 2014 – all rights reserved www.cpalms.org ...
... 3. By which method is heat from deep in Earth's interior transferred to its crust? a. Conduction in the ocean b. Convection in the mantle c. Radiation from the solid core d. Evaporation at mid-ocean ridges © Copyright 2014 – all rights reserved www.cpalms.org ...
Plate Tectonics PPT
... 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 ...
Unit1EarthsStructure 104.50KB 2017-03-29 12
... This heat causes the convection currents to rise (rising limb), until they reach the lithosphere where they diverge. Where the convection current descends (descending limb), due to cooling, the lithosphere is pulled downwards (known as dragging). Plates are at their hottest nearest the mid-oceanic ...
... This heat causes the convection currents to rise (rising limb), until they reach the lithosphere where they diverge. Where the convection current descends (descending limb), due to cooling, the lithosphere is pulled downwards (known as dragging). Plates are at their hottest nearest the mid-oceanic ...
11.30-plate-tectonics
... I. Earth Systems and Resources (10-15%) A. Earth Science Concepts (Geologic time scale; plate tectonics, earthquakes, volcanism; seasons; solar intensity and latitude) ...
... I. Earth Systems and Resources (10-15%) A. Earth Science Concepts (Geologic time scale; plate tectonics, earthquakes, volcanism; seasons; solar intensity and latitude) ...
CH. 7 Review WS #3 - Wachter Middle School
... 2. The theory of plate tectonics is that the Earth’s 2 is divided into plates that move around on top of the 3 . ...
... 2. The theory of plate tectonics is that the Earth’s 2 is divided into plates that move around on top of the 3 . ...
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.