acting 101 homework check
... • SQUEEZING CAN ALSO BE CALLED THE STRESS OF _______. • A)SHEARING • B)COMPRESSION • C)TENSION ...
... • SQUEEZING CAN ALSO BE CALLED THE STRESS OF _______. • A)SHEARING • B)COMPRESSION • C)TENSION ...
Continental drift and plate tectonics
... floor, forming a ridge. Some peaks along mid-ocean ridges rise more than 3 kilometres above the ocean floor. Oceanic crust Heavy oceanic crust is formed from mantle material rising through plate boundaries. The oceanic crust spreads away from the ridge as more and more crust forms. The spreading oce ...
... floor, forming a ridge. Some peaks along mid-ocean ridges rise more than 3 kilometres above the ocean floor. Oceanic crust Heavy oceanic crust is formed from mantle material rising through plate boundaries. The oceanic crust spreads away from the ridge as more and more crust forms. The spreading oce ...
MAR-ECO research expedition to the Charlie
... in the two dives, although the two locations were only separated by a distance of around 15 nautical miles. In general, however, they were surprised by how much life, in fact, was present at these great depths. Another very interesting observation was the presence of so much “marine snow”. Marine sn ...
... in the two dives, although the two locations were only separated by a distance of around 15 nautical miles. In general, however, they were surprised by how much life, in fact, was present at these great depths. Another very interesting observation was the presence of so much “marine snow”. Marine sn ...
Convergent Plate Margins, Subduction Zones, and
... Convergent Plate Margin: 2-D (surficial) plate boundary that is geometrically required for Plate Tectonic theory. Subduction Zone: 3-D region defined by asymmetric sinking of lithosphere into the mantle. Defined by earthquakes at depths <670 km and can be traced deeper with seismic tomography. Subdu ...
... Convergent Plate Margin: 2-D (surficial) plate boundary that is geometrically required for Plate Tectonic theory. Subduction Zone: 3-D region defined by asymmetric sinking of lithosphere into the mantle. Defined by earthquakes at depths <670 km and can be traced deeper with seismic tomography. Subdu ...
Landforms at Plate Boundaries
... other landforms are too large to see in their entirety by an observer on the ground. Being able to see much more of the landform from the air and travel from one end of it to the other allows a better visual perspective and provides clues about its ...
... other landforms are too large to see in their entirety by an observer on the ground. Being able to see much more of the landform from the air and travel from one end of it to the other allows a better visual perspective and provides clues about its ...
Imaging continental collision and subduction in the Pamir mountain
... Subduction of continental crust is the mode of shortening in continental collision that is the least well understood. It is known to occur, as testified e.g., by now exhumed ultra-high-pressure rocks, despite the fact that continental crust is generally too buoyant to submerge into the mantle. Conti ...
... Subduction of continental crust is the mode of shortening in continental collision that is the least well understood. It is known to occur, as testified e.g., by now exhumed ultra-high-pressure rocks, despite the fact that continental crust is generally too buoyant to submerge into the mantle. Conti ...
CHAPTER 3
... Harry Hess, in the early 1960s, first proposed the existence of large convection cells in the mantle that act as conveyor belts for the overlying lithosphere. Where the lithosphere is cracked the hot mantle material is able to escape and pour onto the sea floor in active volcanism. This occurs along ...
... Harry Hess, in the early 1960s, first proposed the existence of large convection cells in the mantle that act as conveyor belts for the overlying lithosphere. Where the lithosphere is cracked the hot mantle material is able to escape and pour onto the sea floor in active volcanism. This occurs along ...
STRUCTURAL GEOLOGY Continental Drift and Seafloor Spreading
... the equator, a glacial sheet covering India as well as the other three land masses would have covered the entire world. Since there is no evidence that this happened, India must have once been much closer to Antarctica. Although Wegner's theory offered explanations for all of these phenomena, it was ...
... the equator, a glacial sheet covering India as well as the other three land masses would have covered the entire world. Since there is no evidence that this happened, India must have once been much closer to Antarctica. Although Wegner's theory offered explanations for all of these phenomena, it was ...
Plate Tectonics - Bakersfield College
... one driving mechanism accounts for all major facets of plate tectonics Researchers agree that convective flow in the rocky 2,900 km-thick mantle is the basic driving force of plate tectonics Several mechanisms generate forces that contribute to plate ...
... one driving mechanism accounts for all major facets of plate tectonics Researchers agree that convective flow in the rocky 2,900 km-thick mantle is the basic driving force of plate tectonics Several mechanisms generate forces that contribute to plate ...
50 PLATE TECTONICS I. Introduction A. General 1. The theory of
... Earlier in the century geologic paradigm was dominated by the belief that ocean basins and continental land masses were permanent and fixed on the surface of the earth. ...
... Earlier in the century geologic paradigm was dominated by the belief that ocean basins and continental land masses were permanent and fixed on the surface of the earth. ...
File
... 1. Seafloor spreading • Henry Hess, a U.S. geologist supported Wegner’s theory of continental drift. – Stated that ridges in the middle of the oceans are pulling apart causing magma to rise to the surface creating new ocean floor at mid ocean ridges. ...
... 1. Seafloor spreading • Henry Hess, a U.S. geologist supported Wegner’s theory of continental drift. – Stated that ridges in the middle of the oceans are pulling apart causing magma to rise to the surface creating new ocean floor at mid ocean ridges. ...
UNIT 10 Plate Tectonics Study Guide
... - Vine and Mathews tested Hess’s hypothesis (1963) by using paleomagnetism studies of the midoceanic ridge near Iceland that was acquired by underwater and aerial magnetometer surveys. - They discovered a pattern of magnetic polarity stripes found within the oceanic crust that formed “parallel lines ...
... - Vine and Mathews tested Hess’s hypothesis (1963) by using paleomagnetism studies of the midoceanic ridge near Iceland that was acquired by underwater and aerial magnetometer surveys. - They discovered a pattern of magnetic polarity stripes found within the oceanic crust that formed “parallel lines ...
Oceanic Crust
... • Oceanic lithosphere subducts underneath the continental lithosphere • Oceanic lithosphere heats and dehydrates as it subsides • The melt rises forming volcanism • E.g. The Andes ...
... • Oceanic lithosphere subducts underneath the continental lithosphere • Oceanic lithosphere heats and dehydrates as it subsides • The melt rises forming volcanism • E.g. The Andes ...
Seafloor Spreading Math Connections
... In the early 20th century, Alfred Wegener developed his theory of continental drift, explaining that the continents on Earth move and historically were in different positions from their current locations today. He used evidence from fossil findings, geologic formations, and coastal outlines of the c ...
... In the early 20th century, Alfred Wegener developed his theory of continental drift, explaining that the continents on Earth move and historically were in different positions from their current locations today. He used evidence from fossil findings, geologic formations, and coastal outlines of the c ...
8-3 Unit Test
... 8. Explain what occurs during a subduction zone? (Include what crust sinks and why) Subduction zone includes both the oceanic and continental crust. The oceanic crust sinks because It is more dense and continental crust is less dense. 9. Which crust is oldest and which crust is the youngest? Explain ...
... 8. Explain what occurs during a subduction zone? (Include what crust sinks and why) Subduction zone includes both the oceanic and continental crust. The oceanic crust sinks because It is more dense and continental crust is less dense. 9. Which crust is oldest and which crust is the youngest? Explain ...
Plate Tectonics Earth`s Interior I. Inside Earth a. Earth`s
... iii. New oceanic crust is hot. But as it moves away from the mid-ocean ridge, it cools and becomes more dense. Eventually, gravity pulls this older, denser oceanic crust down beneath the trench. b. Subduction and Earth’s Oceans i. The processes of subduction and sea-floor spreading can change the si ...
... iii. New oceanic crust is hot. But as it moves away from the mid-ocean ridge, it cools and becomes more dense. Eventually, gravity pulls this older, denser oceanic crust down beneath the trench. b. Subduction and Earth’s Oceans i. The processes of subduction and sea-floor spreading can change the si ...
Theory of Plate Tectonics
... • The Earth’s crust and uppermost solid mantle are broken into sections called plates • Plates move around on top of the mantle like rafts ...
... • The Earth’s crust and uppermost solid mantle are broken into sections called plates • Plates move around on top of the mantle like rafts ...
here
... In 1959, Princeton University Professor Harry Hess proposed: Ocean ridges are positioned above mantle upwellings, which cause the seafloor to spread, like a conveyor belt. ...
... In 1959, Princeton University Professor Harry Hess proposed: Ocean ridges are positioned above mantle upwellings, which cause the seafloor to spread, like a conveyor belt. ...
Define and Differentiate Earthquakes and Plate Tectonics Submitted
... activity that form in complex fault systems along the suture zone. Earthquake patterns in subduction zones are more complex. As the oceanic crust begins to descend, it begins to break into blocks because of tension stress. Shallow earthquakes in the upper part of the subduction zone are a result of ...
... activity that form in complex fault systems along the suture zone. Earthquake patterns in subduction zones are more complex. As the oceanic crust begins to descend, it begins to break into blocks because of tension stress. Shallow earthquakes in the upper part of the subduction zone are a result of ...
Continental Drift
... 12-19 DIVERGENT BOUNDARIES In some parts of the world there is upwelling of hot material from the mantle in what are known as “mantle plumes. This causes the overlying lithosphere to bulge upward and eventually break apart. Where plates move apart from one another or “diverge”, new lithosphere is f ...
... 12-19 DIVERGENT BOUNDARIES In some parts of the world there is upwelling of hot material from the mantle in what are known as “mantle plumes. This causes the overlying lithosphere to bulge upward and eventually break apart. Where plates move apart from one another or “diverge”, new lithosphere is f ...
CHAPTER 3
... Major Concept (VII) Plate tectonics is a broad theory of Earth’s dynamic nature that includes the concepts of continental drift and seafloor spreading. Related or supporting concepts: - The lithosphere consists of seven major, and six smaller, rigid plates that move with respect to one another and i ...
... Major Concept (VII) Plate tectonics is a broad theory of Earth’s dynamic nature that includes the concepts of continental drift and seafloor spreading. Related or supporting concepts: - The lithosphere consists of seven major, and six smaller, rigid plates that move with respect to one another and i ...
IGNEOUS ROCK ASSOCIATIONS
... mostly formed by hotspot volcanism deep in the mantle usually silica undersaturated, olivine basalts; can include phonolites and nephelinites; can have a wide range of chemical compositions due to fractional crystallization. richer in alkalis and TiO2 compared to MORB’s ...
... mostly formed by hotspot volcanism deep in the mantle usually silica undersaturated, olivine basalts; can include phonolites and nephelinites; can have a wide range of chemical compositions due to fractional crystallization. richer in alkalis and TiO2 compared to MORB’s ...
UNIT 10 Plate Tectonics Study Guide
... - Radioactive age-dating of the oceanic basalt rock core was found to be youngest at the ocean’s mountainous center and no more than 200 million years old at the ocean edges near the continents. - The oldest deep oceanic sediments, called “oozes” are no more than 200 million years old. (It is estim ...
... - Radioactive age-dating of the oceanic basalt rock core was found to be youngest at the ocean’s mountainous center and no more than 200 million years old at the ocean edges near the continents. - The oldest deep oceanic sediments, called “oozes” are no more than 200 million years old. (It is estim ...
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.