Magnetic Field, Sea-floor Spreading, Deep
... reversals recorded on the ocean floor The magnetic poles can change place (called magnetic reversal) Magnetic mineral grains line up in opposite direction of magnetic field ...
... reversals recorded on the ocean floor The magnetic poles can change place (called magnetic reversal) Magnetic mineral grains line up in opposite direction of magnetic field ...
History in Geography
... • Scientists were not surprised to learn that seafloor rocks contain the magnetic mineral magnetite ...
... • Scientists were not surprised to learn that seafloor rocks contain the magnetic mineral magnetite ...
Theory of Plate Tectonics
... deep underwater canyons are deep-ocean trenches. • Subduction is the process by which the ocean floor sinks beneath a deepocean trench and back into the mantle. ...
... deep underwater canyons are deep-ocean trenches. • Subduction is the process by which the ocean floor sinks beneath a deepocean trench and back into the mantle. ...
File - Physical Science
... Name _______________________ Earth Science Exam II 1. The former late Paleozoic supercontinent is known as ________. A) Pandomonia B) Pancakea C) Pangaea D) Panatopia 2. Pull-apart rift zones are generally associated with a ________ plate boundary. A) transform B) divergent C) convergent D) all plat ...
... Name _______________________ Earth Science Exam II 1. The former late Paleozoic supercontinent is known as ________. A) Pandomonia B) Pancakea C) Pangaea D) Panatopia 2. Pull-apart rift zones are generally associated with a ________ plate boundary. A) transform B) divergent C) convergent D) all plat ...
Sea Floor Evidence The technologies developed in the 1940s and
... Modern plate tectonic theory. By the 1960s, the theories of continental drift and sea floor spreading were supported by reliable scientific data and combined to develop modern‐day plate tectonic theory. The theory maintains that the crust and uppermost mantle, or lithosphere, is segmented into a num ...
... Modern plate tectonic theory. By the 1960s, the theories of continental drift and sea floor spreading were supported by reliable scientific data and combined to develop modern‐day plate tectonic theory. The theory maintains that the crust and uppermost mantle, or lithosphere, is segmented into a num ...
Plate Tectonics
... trenches brings water under the other plate and lowers the melting point so that magma is formed and rises up. • Sometimes creates a string of islands called an island arc is created along the curve of the trench. • When oceanic plate sinks beneath continental crust, volcanic mountains, like Andes, ...
... trenches brings water under the other plate and lowers the melting point so that magma is formed and rises up. • Sometimes creates a string of islands called an island arc is created along the curve of the trench. • When oceanic plate sinks beneath continental crust, volcanic mountains, like Andes, ...
Plate Tectonics
... inferred slow circulation of the plastic mantle by a process called (1) insolation (3) conduction (2) convection (4) radiation ...
... inferred slow circulation of the plastic mantle by a process called (1) insolation (3) conduction (2) convection (4) radiation ...
Chapter 1, Section 5 – The Theory of Plate Tectonics
... i. Movement of plates in lithosphere powered by convection currents ii. Plates collide, pull apart, or grind past each other = changes in Earth’s surface 1. creates volcanoes, mountain ranges, and deep ocean trenches iii. plate movement is incredibly slow – only 1 – 24 cm. per year! ...
... i. Movement of plates in lithosphere powered by convection currents ii. Plates collide, pull apart, or grind past each other = changes in Earth’s surface 1. creates volcanoes, mountain ranges, and deep ocean trenches iii. plate movement is incredibly slow – only 1 – 24 cm. per year! ...
Global phosphorus cycle
... 1) Changes in oceanic P inventories can affect atmospheric CO2 levels. Elevated biological productivity → enhanced consumption of surface water CO2 → invasion of atmospheric CO2 P as a limiting nutrient limits CO2 draw-down 2) Assessing paleoceanographic P levels Cd:Ca ratio in benthic forams ...
... 1) Changes in oceanic P inventories can affect atmospheric CO2 levels. Elevated biological productivity → enhanced consumption of surface water CO2 → invasion of atmospheric CO2 P as a limiting nutrient limits CO2 draw-down 2) Assessing paleoceanographic P levels Cd:Ca ratio in benthic forams ...
The layers of the Crust
... approximately 200 km thick (under continental crust) and breaks up into tectonic plates. The Lithosphere is the "plate" of the Plate Tectonic theory. The base of the Lithospheres is marked by a "low-velocity" seismic zone where seismic waves slow down as they enter the warm, plastic Asthenosphere. T ...
... approximately 200 km thick (under continental crust) and breaks up into tectonic plates. The Lithosphere is the "plate" of the Plate Tectonic theory. The base of the Lithospheres is marked by a "low-velocity" seismic zone where seismic waves slow down as they enter the warm, plastic Asthenosphere. T ...
PS 2-6-08 - elyceum-beta
... • Used Sonar (invented during WWII) to map the Ocean Floor To Produce underwater maps for Submarines Found that there was a huge ridge of mountains in the middle of the Atlantic ocean ...
... • Used Sonar (invented during WWII) to map the Ocean Floor To Produce underwater maps for Submarines Found that there was a huge ridge of mountains in the middle of the Atlantic ocean ...
Plate Tectonics - Duplin County Schools
... 2. Oceanic-Oceanic Collision • More dense crust is subducted, melts, rises, forms island arc ...
... 2. Oceanic-Oceanic Collision • More dense crust is subducted, melts, rises, forms island arc ...
The Theory of Plate Tectonics
... Hot spots are places where a plume of hot magma rises from the mantle and forces its way through the Lithosphere to form volcanoes. As the plate moves, new volcanoes are created. One example are the Hawaiian Islands. ...
... Hot spots are places where a plume of hot magma rises from the mantle and forces its way through the Lithosphere to form volcanoes. As the plate moves, new volcanoes are created. One example are the Hawaiian Islands. ...
Chapter 3 The Origin of Ocean Basins LEARNING OBJECTIVES 1
... volcanism in terms of the concept of global plate tectonics. 5. Calculate spreading rates of ocean basins. CHAPTER OUTLINE A. Ocean basin is defined as that part of the sea floor deeper than 2000 m (6000 ft). 3-1. Continental Drift B. Based upon the fit of continental outlines and fossil and geologi ...
... volcanism in terms of the concept of global plate tectonics. 5. Calculate spreading rates of ocean basins. CHAPTER OUTLINE A. Ocean basin is defined as that part of the sea floor deeper than 2000 m (6000 ft). 3-1. Continental Drift B. Based upon the fit of continental outlines and fossil and geologi ...
Flowing water ecosystems, such as streams and rivers, are also
... When rivers flow into the ocean, they create a zone of mixing of freshwater with saltwater referred to as a(n) ________. ________ refers to the plants and animals living on the bottom of the ocean. What are some important factors for life in freshwater ecosystems? In lakes and ponds, photosynthesis ...
... When rivers flow into the ocean, they create a zone of mixing of freshwater with saltwater referred to as a(n) ________. ________ refers to the plants and animals living on the bottom of the ocean. What are some important factors for life in freshwater ecosystems? In lakes and ponds, photosynthesis ...
Lecture 2
... between the Earth's lithosphere and asthenosphere such that the tectonic plates (continental and ocean crusts) "float" at an elevation which depends on their thickness and density. (similar to ice floating in water). ...
... between the Earth's lithosphere and asthenosphere such that the tectonic plates (continental and ocean crusts) "float" at an elevation which depends on their thickness and density. (similar to ice floating in water). ...
Lecture#3 part1: Dynamic Earth
... Earth's spin caused the continents to move, plowing through the oceanic plate and producing mountains on their leading edges. ...
... Earth's spin caused the continents to move, plowing through the oceanic plate and producing mountains on their leading edges. ...
Blakeley Jones GEOL 1104 Review 6 – Earth`s Interior and Plate
... 28) The modern-day Red Sea is explained by plate tectonics theory because it is ________. a. a tiny remnant of a once immense ocean that was closed as Africa moved Asia b. the site of a transform fault along which Arabia is moving away from Africa c. a rift zone that may eventually open into a major ...
... 28) The modern-day Red Sea is explained by plate tectonics theory because it is ________. a. a tiny remnant of a once immense ocean that was closed as Africa moved Asia b. the site of a transform fault along which Arabia is moving away from Africa c. a rift zone that may eventually open into a major ...
Geology 101 chapter2 Plate tectonics
... mechanism that drives seafloor spreading was thermal convection cells in the mantle hot magma rises from mantle to form new crust cold crust subducts into the mantle at oceanic trenches, where it is heated and recycled ...
... mechanism that drives seafloor spreading was thermal convection cells in the mantle hot magma rises from mantle to form new crust cold crust subducts into the mantle at oceanic trenches, where it is heated and recycled ...
Sea Floor Mapping Lesson Plan Part 2
... include crustal deformation, volcanic eruption, and deposition of sediment, while destructive forces include weathering and erosion ...
... include crustal deformation, volcanic eruption, and deposition of sediment, while destructive forces include weathering and erosion ...
Wednesday Sept 8th
... YES!! The density of the plates determines which will be on top after a collision. More dense sinks Less dense goes on top ...
... YES!! The density of the plates determines which will be on top after a collision. More dense sinks Less dense goes on top ...
File
... Plate Movement O occurs when one oceanic plate is forced down into the mantle beneath a second plate ...
... Plate Movement O occurs when one oceanic plate is forced down into the mantle beneath a second plate ...
PhET Plate Tectonics Simulation Lab
... How can you adjust the 3 variables to make your crust like oceanic crust? ___________________ _____________________________________________________________________ How can you adjust the 3 variables to make your crust like continental crust? ________________ _________________________________________ ...
... How can you adjust the 3 variables to make your crust like oceanic crust? ___________________ _____________________________________________________________________ How can you adjust the 3 variables to make your crust like continental crust? ________________ _________________________________________ ...
Plate Tectonics - Holy Angels School
... ways, depending on the types of crust involved. • At a divergent boundary, two plates move away from each other, and magma rises to form new lithosphere at mid-ocean ridges. • A boundary at which two plates move past each other horizontally is called a transform boundary. At transform boundaries, th ...
... ways, depending on the types of crust involved. • At a divergent boundary, two plates move away from each other, and magma rises to form new lithosphere at mid-ocean ridges. • A boundary at which two plates move past each other horizontally is called a transform boundary. At transform boundaries, th ...
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.