Plate Tectonics – A Geologic Revolution
... Earthquakes associated with oceanic trenches extended to great depths. This was a puzzle because for earthquakes to occur rocks must behave as elastic solids. At depths below 70 km rocks do not behave as elastic solids. ...
... Earthquakes associated with oceanic trenches extended to great depths. This was a puzzle because for earthquakes to occur rocks must behave as elastic solids. At depths below 70 km rocks do not behave as elastic solids. ...
Plate Tectonics
... Summary of Important Concepts, continued • Alfred Wegener, in the early 1900’s, was the first person to gather evidence that the continents had moved - a process called continental drift. His evidence suggested that the continents on both sides of the Atlantic Ocean had once been joined into a sing ...
... Summary of Important Concepts, continued • Alfred Wegener, in the early 1900’s, was the first person to gather evidence that the continents had moved - a process called continental drift. His evidence suggested that the continents on both sides of the Atlantic Ocean had once been joined into a sing ...
Unit 4: Rock Cycle and Plate Tectonics Text Questions
... 11. Why do oceanic plates subduct at different angles? Give a location where the subduction angle is shallow, and another where it is steep. How does this relate to where are the deepest oceanic trenches are found? 12. Compare/contrast a continental volcanic arc with a volcanic island arc. List at l ...
... 11. Why do oceanic plates subduct at different angles? Give a location where the subduction angle is shallow, and another where it is steep. How does this relate to where are the deepest oceanic trenches are found? 12. Compare/contrast a continental volcanic arc with a volcanic island arc. List at l ...
Shifting Plates Choice Board
... The following are questions for each topic that you and your partner should answer within your project and ideas to use for your project: The Different Layers of Earth ...
... The following are questions for each topic that you and your partner should answer within your project and ideas to use for your project: The Different Layers of Earth ...
Backward Design Learning Plan - UNC
... continents are found on both continents), and ancient climates (glacial deposits in Africa, coal deposits in Antarctica) The theory of continental drift was not accepted until the 1960s because scientists were not sure what force could move continents and how the could move without shattering (they ...
... continents are found on both continents), and ancient climates (glacial deposits in Africa, coal deposits in Antarctica) The theory of continental drift was not accepted until the 1960s because scientists were not sure what force could move continents and how the could move without shattering (they ...
First lecture - 5 January, 2015
... E. Paleomagnetic evidence and dating of the sea floor rocks indicates new crust is being formed at the mid-oceanic rise and ridge system (MORRS), and is moving outwards from this area. Radiometric dating of these rocks shows they get progressively older the farther away one is from the ridge. We ha ...
... E. Paleomagnetic evidence and dating of the sea floor rocks indicates new crust is being formed at the mid-oceanic rise and ridge system (MORRS), and is moving outwards from this area. Radiometric dating of these rocks shows they get progressively older the farther away one is from the ridge. We ha ...
Plate Tectonics and Continental Drift
... 3. What are the forces that drive plate tectonics? 4. What happens at the boundaries between plates? 5. How do the different types of plate boundaries impact the regional geology and geomorphology? 6. How has continental drift affected the positions of the continents over time? ...
... 3. What are the forces that drive plate tectonics? 4. What happens at the boundaries between plates? 5. How do the different types of plate boundaries impact the regional geology and geomorphology? 6. How has continental drift affected the positions of the continents over time? ...
Plate tectonics notes
... tectonics to the formation of crustal features; • TEKS 6.10C identify the major tectonic plates • TEKS 6.10D describe how plate tectonics causes major geological events such as ocean basins, earthquakes, volcanic eruptions, and mountain building ...
... tectonics to the formation of crustal features; • TEKS 6.10C identify the major tectonic plates • TEKS 6.10D describe how plate tectonics causes major geological events such as ocean basins, earthquakes, volcanic eruptions, and mountain building ...
Physical Lecture 3 Fall 2012
... 19. Old oceanic plate material typically produces a ? subduction zone than younger oceanic plate material. A.less steep B.steeper 20. The oldest ocean rocks preserved on the ocean floor are about ? years old. A.100 million B.200 million C.540 million D.1 billion E.4.4 billion 21. Earth magnetism is ...
... 19. Old oceanic plate material typically produces a ? subduction zone than younger oceanic plate material. A.less steep B.steeper 20. The oldest ocean rocks preserved on the ocean floor are about ? years old. A.100 million B.200 million C.540 million D.1 billion E.4.4 billion 21. Earth magnetism is ...
GLOBAL PLATE TECTONICS AND GEODYNAMICS
... DIRECTOR: TROND H. TORSVIK Assoc. DIRECTOR: CARMEN GAINA ...
... DIRECTOR: TROND H. TORSVIK Assoc. DIRECTOR: CARMEN GAINA ...
Plate boundaries - MrD-Home
... Wilson then unified the ideas of Wegener and Hess into the plate tectonic theory. He explained continental drift occurs because of areas like these ridges, that _______ push along ________________ tectonic plates floating on Earth’s surface. ...
... Wilson then unified the ideas of Wegener and Hess into the plate tectonic theory. He explained continental drift occurs because of areas like these ridges, that _______ push along ________________ tectonic plates floating on Earth’s surface. ...
GEOMORPHOLOGY
... SIAL – Silica and Aluminia Oceanic Crust 5 – 6 km SIMA – Silica and Continental crust 5 – 70km Magnesium Approximately 2800km Mainly solid rock, but may 1000°C become “plastic” in nature as rocks start to melt Approximately 2200km ...
... SIAL – Silica and Aluminia Oceanic Crust 5 – 6 km SIMA – Silica and Continental crust 5 – 70km Magnesium Approximately 2800km Mainly solid rock, but may 1000°C become “plastic” in nature as rocks start to melt Approximately 2200km ...
Quiz 1 (Key)
... Multiple Choice: Answer each question with the one most appropriate answer (10 pts) 1. Reversals of the Earth’s magnetic poles: a) are not well understood; b) provide evidence, through paleomagnetism, for seafloor spreading; c) are recorded in the permanent magnetism of lavas millions of years old; ...
... Multiple Choice: Answer each question with the one most appropriate answer (10 pts) 1. Reversals of the Earth’s magnetic poles: a) are not well understood; b) provide evidence, through paleomagnetism, for seafloor spreading; c) are recorded in the permanent magnetism of lavas millions of years old; ...
snack_tectonics_lab_lt_2015 Power Point
... sinking into the mantle, as the plates converge. When an oceanic plate pushes into and subducts under a continental plate, the overriding plate is lifted up and a volcanic mountain range can be created Example: ...
... sinking into the mantle, as the plates converge. When an oceanic plate pushes into and subducts under a continental plate, the overriding plate is lifted up and a volcanic mountain range can be created Example: ...
The Edible Earth: Plate Movements
... twenty separate plates that “float” on the hot plastic mantle of the inner Earth. The theory also states that the motion of these plates creates a variety of interactions at the plate boundaries. The boundaries of these crust plates collide, diverge, or slip past each other. Some crust plate boundar ...
... twenty separate plates that “float” on the hot plastic mantle of the inner Earth. The theory also states that the motion of these plates creates a variety of interactions at the plate boundaries. The boundaries of these crust plates collide, diverge, or slip past each other. Some crust plate boundar ...
Plate Tectonics
... Earth. • The edges of the plates are called boundaries. • There are three types of motion seen at the plate boundaries. ...
... Earth. • The edges of the plates are called boundaries. • There are three types of motion seen at the plate boundaries. ...
Letter to the Author
... on the basis of what we know about the mantle, but we must bear in mind the distinction between the possible and the actual. More recently Thomas Gold has examined polar wandering from a different point of view. A beetle on the earth’s crust will cause it to move relative to the axis of rotation me ...
... on the basis of what we know about the mantle, but we must bear in mind the distinction between the possible and the actual. More recently Thomas Gold has examined polar wandering from a different point of view. A beetle on the earth’s crust will cause it to move relative to the axis of rotation me ...
Date: Earth Science Reference Tables Practice 1. What kind of plate
... 3. Which geologic structure is represented by the double line separating the North American plate from the African and Eurasian plates? (1) Thick continental crust (2) Thick layers of sediment (3) A mid-ocean ridge (4) Gigantic igneous rock 4. Which feature is commonly formed at a plate boundary whe ...
... 3. Which geologic structure is represented by the double line separating the North American plate from the African and Eurasian plates? (1) Thick continental crust (2) Thick layers of sediment (3) A mid-ocean ridge (4) Gigantic igneous rock 4. Which feature is commonly formed at a plate boundary whe ...
Lesson 7 - Plate Tectonics, Earthquakes and Volcanoes
... Similar geologic structures (e.g., rocks) on the matching coastlines of North America and Europe Similar plant and animal fossils found on the matching coastlines of South America and Africa Dramatic climate changes on some continents AND the fossil remnants of the change (e.g., fossils of tro ...
... Similar geologic structures (e.g., rocks) on the matching coastlines of North America and Europe Similar plant and animal fossils found on the matching coastlines of South America and Africa Dramatic climate changes on some continents AND the fossil remnants of the change (e.g., fossils of tro ...
- Catalyst
... The lithosphere is broken up into seven or eight major tectonic plates and several minor plates. Plate boundaries are defined by the relative motion between adjacent plates: divergent, convergent or transform. ...
... The lithosphere is broken up into seven or eight major tectonic plates and several minor plates. Plate boundaries are defined by the relative motion between adjacent plates: divergent, convergent or transform. ...
A Living Planet
... Oceanic Landforms- landforms found on the sea floor Continental shelf is located here Continental Landforms- landforms found on the earth Relief the difference in elevation of a landform from its lowest point to its highest point (1) Mountains (2) hills (3) plains (4) plateaus ...
... Oceanic Landforms- landforms found on the sea floor Continental shelf is located here Continental Landforms- landforms found on the earth Relief the difference in elevation of a landform from its lowest point to its highest point (1) Mountains (2) hills (3) plains (4) plateaus ...
Unit 7 Lesson 1 Forces that Change the Earth
... divergent plate boundary under the ocean sea-floor spreading: the process by which molten material adds new oceanic crust to the ocean floor deep-ocean trench: a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle subduction: the process by which oceanic crus ...
... divergent plate boundary under the ocean sea-floor spreading: the process by which molten material adds new oceanic crust to the ocean floor deep-ocean trench: a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle subduction: the process by which oceanic crus ...
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.