Lecture Chapter 7 Part 2
... • Only a thin layer of sediment covers the sea floor basalt. • Sea floor rocks date to less than 200 million years (most less than 150 million years). • No seafloor rocks are older than 200 million years. ...
... • Only a thin layer of sediment covers the sea floor basalt. • Sea floor rocks date to less than 200 million years (most less than 150 million years). • No seafloor rocks are older than 200 million years. ...
Chap02
... • He suggested that all continents had been joined in a single supercontinent which he named Pangaea. • He proposed that Pangaea began up 180 million years ago. • Not widely accepted at the time. ...
... • He suggested that all continents had been joined in a single supercontinent which he named Pangaea. • He proposed that Pangaea began up 180 million years ago. • Not widely accepted at the time. ...
Skinner Chapter 4
... 39. A chain of volcanic islands that forms above a subduction zone is called a(n) _________________. 40. The temperature above which a magnetic material loses its permanent magnetism is called its __________________. 41. What is the source of the Earth's magnetism? 42. What is a Benioff Zone? 43. D ...
... 39. A chain of volcanic islands that forms above a subduction zone is called a(n) _________________. 40. The temperature above which a magnetic material loses its permanent magnetism is called its __________________. 41. What is the source of the Earth's magnetism? 42. What is a Benioff Zone? 43. D ...
Plate Tectonics Station Notes
... Why do earthquakes occur here often? (Use your webquest to answer) ...
... Why do earthquakes occur here often? (Use your webquest to answer) ...
Volcanoes and Igneous Activity Earth
... Plate tectonics and earthquakes • Plate tectonics model accounts for the global distribution of earthquakes – Absence of deep-focus earthquakes along the oceanic ridge is consistent with tectonic theory ...
... Plate tectonics and earthquakes • Plate tectonics model accounts for the global distribution of earthquakes – Absence of deep-focus earthquakes along the oceanic ridge is consistent with tectonic theory ...
esss09 - 4J Blog Server
... The main objection to Wegener’s hypothesis was that he could not describe a mechanism capable of moving the continents. • The theory of plate tectonics proved that Wegener was correct. 9.2 Sea-Floor Spreading Earth’s mid-ocean ridge system forms the longest features on Earth’s surface. The system wi ...
... The main objection to Wegener’s hypothesis was that he could not describe a mechanism capable of moving the continents. • The theory of plate tectonics proved that Wegener was correct. 9.2 Sea-Floor Spreading Earth’s mid-ocean ridge system forms the longest features on Earth’s surface. The system wi ...
The fate of continental fragments during subduction at high
... The behaviour of the continental crust subducted to high pressure (HP) conditions remains generally poorly known. Where continental HP-fragments are exhumed back to the surface, they provide insight into the processes occurring at convergent margins. This study is focussed on the central Sesia Zone, ...
... The behaviour of the continental crust subducted to high pressure (HP) conditions remains generally poorly known. Where continental HP-fragments are exhumed back to the surface, they provide insight into the processes occurring at convergent margins. This study is focussed on the central Sesia Zone, ...
What’s inside the Earth? Is there really another world at
... – It is thinner, but more dense than continental crust, so it sits lower than continental crust. – Composed of basalt (volcanic). ...
... – It is thinner, but more dense than continental crust, so it sits lower than continental crust. – Composed of basalt (volcanic). ...
Powerpoint Presentation Physical Geology, 10th ed.
... – Plates move apart – Magma rises, cools and forms new lithosphere – Typically expressed as mid-oceanic ridges ...
... – Plates move apart – Magma rises, cools and forms new lithosphere – Typically expressed as mid-oceanic ridges ...
Setting up the Stage for Project MoHole - Myweb.dal.ca
... to be explored. (2) 2D long-offset (³8-km streamer) MCS data. In recent years 2D MCS data collected with 6-km-long hydrophone streamers have resulted in seismic images of the lower oceanic crust, Moho, and sub-Moho structure of unprecedented quality and detail, contributing to a better understanding ...
... to be explored. (2) 2D long-offset (³8-km streamer) MCS data. In recent years 2D MCS data collected with 6-km-long hydrophone streamers have resulted in seismic images of the lower oceanic crust, Moho, and sub-Moho structure of unprecedented quality and detail, contributing to a better understanding ...
Lithospheric Plates
... Another aspect to consider in the Earth System: Rates of geologic processes ...
... Another aspect to consider in the Earth System: Rates of geologic processes ...
Seafloor Spreading.pps
... Another aspect to consider in the Earth System: Rates of geologic processes ...
... Another aspect to consider in the Earth System: Rates of geologic processes ...
Plate boundaries: study information from class only
... Map and crosssection views of the subduction zone The oceanic Juan de Fuca plate subducts under the continental North American Plate ...
... Map and crosssection views of the subduction zone The oceanic Juan de Fuca plate subducts under the continental North American Plate ...
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 ...
Prentice Hall
... 13. Circle the sentences that are true about the theory of plate tectonics. a. The ocean floor sinks back into the mantle at subduction zones. b. The heat that drives convection currents comes from solar energy. c. Hot rock rises at mid-ocean ridges, cools and spreads out as ocean sea floor. d. Plat ...
... 13. Circle the sentences that are true about the theory of plate tectonics. a. The ocean floor sinks back into the mantle at subduction zones. b. The heat that drives convection currents comes from solar energy. c. Hot rock rises at mid-ocean ridges, cools and spreads out as ocean sea floor. d. Plat ...
Oceanography Test:
... __________ 37. Presque Isle sand is entirely black because the sand is formed from black, volcanic rocks. __________ 38. A rocky shoreline is old geologically. __________ 39. The circular patterns of the surface currents are caused by wind. __________ 40. A sea sponge is a producer that makes its ow ...
... __________ 37. Presque Isle sand is entirely black because the sand is formed from black, volcanic rocks. __________ 38. A rocky shoreline is old geologically. __________ 39. The circular patterns of the surface currents are caused by wind. __________ 40. A sea sponge is a producer that makes its ow ...
Chapter 3 HW (due 8 Feb for Section 5803, 9 Feb for Section 5804)
... e) convection cells in the upper mantle and the tug of the descending plates. 21. A mantle plume is a) a place where the mantle rises through the crust and forms a volcano. b) a column of superheated mantle that originates at the core-mantle boundary and can lift an entire continent. c) a place wher ...
... e) convection cells in the upper mantle and the tug of the descending plates. 21. A mantle plume is a) a place where the mantle rises through the crust and forms a volcano. b) a column of superheated mantle that originates at the core-mantle boundary and can lift an entire continent. c) a place wher ...
... Midocean ridge rocks are _____________ than surrounding ocean floor rocks Midocean ridge volcanoes are _________________ than volcanoes further away Ocean floor sediments are _______ on the ridges and get ____________ as the distance from the ridges increase Polar reversal magnetism proves that the ...
I. Convergent plate boundaries (destructive margins) (colliding
... b. Age of deepest sediments in any area (those upon basalt sea floor) 1) Youngest are near the ridges 2) Older are at a distance from the ridge c. Supports tectonic hypothesis prediction that ocean basins are geologically young 1. oldest sea floor sediments found are 180 m.a. 2. continental crust, b ...
... b. Age of deepest sediments in any area (those upon basalt sea floor) 1) Youngest are near the ridges 2) Older are at a distance from the ridge c. Supports tectonic hypothesis prediction that ocean basins are geologically young 1. oldest sea floor sediments found are 180 m.a. 2. continental crust, b ...
OBJECTIVES: Students will gain an understanding of how
... Scientists refer to the Mid-Atlantic submarine mountainous region as the Mid-Atlantic Ridge. The Theory of Seafloor Spreading states that seafloor spreading is a process that occurs at mid-ocean ridges, where new ocean crust is formed through volcanic activity and then gradually moves away from the ...
... Scientists refer to the Mid-Atlantic submarine mountainous region as the Mid-Atlantic Ridge. The Theory of Seafloor Spreading states that seafloor spreading is a process that occurs at mid-ocean ridges, where new ocean crust is formed through volcanic activity and then gradually moves away from the ...
Chapter 17 Review game
... Briefly explain how the continents move? The continents (Thick slabs of granitic crust) are riding on top of the ocean crust (thinner more dense layer of basalt). As the new ocean crust forms at divergent plate boundaries, the old crust is pushed away and the continents go along for the ride. ...
... Briefly explain how the continents move? The continents (Thick slabs of granitic crust) are riding on top of the ocean crust (thinner more dense layer of basalt). As the new ocean crust forms at divergent plate boundaries, the old crust is pushed away and the continents go along for the ride. ...
StudyGuide-for-Oceans-2015-key
... 11.Describe how a wave breaks on the shore (put the step in order) Moving water molecules hit the ocean floor and the top of the wave falls over the now slower moving bottom. The top of the wave breaks and water moves toward shore ...
... 11.Describe how a wave breaks on the shore (put the step in order) Moving water molecules hit the ocean floor and the top of the wave falls over the now slower moving bottom. The top of the wave breaks and water moves toward shore ...
Unit 5: Ocean Floor Structure and Plate Tectonics
... 1. divergent – “pulled apart” - the crust is extended, thinned, and fractured by the rising of hot mantle material (new crust is being formed as magma comes out of rifts or volcanoes). Parallel ridges emerge as new ocean floor spreads out on either side of an ocean ridge. 2. convergent – “collide to ...
... 1. divergent – “pulled apart” - the crust is extended, thinned, and fractured by the rising of hot mantle material (new crust is being formed as magma comes out of rifts or volcanoes). Parallel ridges emerge as new ocean floor spreads out on either side of an ocean ridge. 2. convergent – “collide to ...
Abyssal plain
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3000 and 6000 m. Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth’s surface. They are among the flattest, smoothest and least explored regions on Earth. Abyssal plains are key geologic elements of oceanic basins (the other elements being an elevated mid-ocean ridge and flanking abyssal hills). In addition to these elements, active oceanic basins (those that are associated with a moving plate tectonic boundary) also typically include an oceanic trench and a subduction zone.Abyssal plains were not recognized as distinct physiographic features of the sea floor until the late 1940s and, until very recently, none had been studied on a systematic basis. They are poorly preserved in the sedimentary record, because they tend to be consumed by the subduction process. The creation of the abyssal plain is the end result of spreading of the seafloor (plate tectonics) and melting of the lower oceanic crust. Magma rises from above the asthenosphere (a layer of the upper mantle) and as this basaltic material reaches the surface at mid-ocean ridges it forms new oceanic crust. This is constantly pulled sideways by spreading of the seafloor. Abyssal plains result from the blanketing of an originally uneven surface of oceanic crust by fine-grained sediments, mainly clay and silt. Much of this sediment is deposited by turbidity currents that have been channelled from the continental margins along submarine canyons down into deeper water. The remainder of the sediment is composed chiefly of pelagic sediments. Metallic nodules are common in some areas of the plains, with varying concentrations of metals, including manganese, iron, nickel, cobalt, and copper. These nodules may provide a significant resource for future mining ventures.Owing in part to their vast size, abyssal plains are currently believed to be a major reservoir of biodiversity. The abyss also exerts significant influence upon ocean carbon cycling, dissolution of calcium carbonate, and atmospheric CO2 concentrations over timescales of 100–1000 years. The structure and function of abyssal ecosystems are strongly influenced by the rate of flux of food to the seafloor and the composition of the material that settles. Factors such as climate change, fishing practices, and ocean fertilization are expected to have a substantial effect on patterns of primary production in the euphotic zone. This will undoubtedly impact the flux of organic material to the abyss in a similar manner and thus have a profound effect on the structure, function and diversity of abyssal ecosystems.