oceans - Sir C R R College
... chains that are mightier than the Himalaya, called the mid- oceanic ridges, which run in the middle of all the major oceans for a total length of about 74,000 km. Mid-oceanic ridges are centres of sea-floor spreading where new ocean crust is created by outpouring of lava. ...
... chains that are mightier than the Himalaya, called the mid- oceanic ridges, which run in the middle of all the major oceans for a total length of about 74,000 km. Mid-oceanic ridges are centres of sea-floor spreading where new ocean crust is created by outpouring of lava. ...
Take A Journey to… - Mr. Jensen`s Science
... Glossopteris, in Africa, South America, Antarctica, and Australia. • Fossils of the reptile Mesosaurus were found in Africa and South America. These were freshwater and land animal, so it is unlikely they swam across the ocean. • Wegener also found fossils in cold, icy Antarctica of organisms that l ...
... Glossopteris, in Africa, South America, Antarctica, and Australia. • Fossils of the reptile Mesosaurus were found in Africa and South America. These were freshwater and land animal, so it is unlikely they swam across the ocean. • Wegener also found fossils in cold, icy Antarctica of organisms that l ...
Seafloor Spreading and Plate Tectonics
... boundary), crust formed by offset segments becomes welded together to form the trace of the transform fault. Entire structure is called a Fracture zone. ...
... boundary), crust formed by offset segments becomes welded together to form the trace of the transform fault. Entire structure is called a Fracture zone. ...
ch 7-3 Plate Tectonics PowerPoint (plate boundaries)
... Possible causes of tectonic motion — convection currents (website) in asthenosphere ...
... Possible causes of tectonic motion — convection currents (website) in asthenosphere ...
File - GAIA POWER PLANTS
... temperatures ranging up to 56 °C and salinities to 270 parts per thousand, which is about 7 1/2 times that of normal seawater. Metallic trace elements, such as zinc, copper, and cobalt, are present in concentrations exceeding those of normal seawater by about 1,000 times. The upper 10 metres of sedi ...
... temperatures ranging up to 56 °C and salinities to 270 parts per thousand, which is about 7 1/2 times that of normal seawater. Metallic trace elements, such as zinc, copper, and cobalt, are present in concentrations exceeding those of normal seawater by about 1,000 times. The upper 10 metres of sedi ...
see powerpoint
... The process by which new oceanic crust forms at mid-ocean ridges as tectonic plates are pulled away from each other. ...
... The process by which new oceanic crust forms at mid-ocean ridges as tectonic plates are pulled away from each other. ...
Plate Tectonic Theory
... B.When examining rock samples from the ocean floor, identify 2 things that can be found that support the hypothesis of sea floor spreading. ...
... B.When examining rock samples from the ocean floor, identify 2 things that can be found that support the hypothesis of sea floor spreading. ...
Earth Science
... http://education.nationalgeographic.com/educati on/encyclopedia/ocean-trench/?ar_a=1 ...
... http://education.nationalgeographic.com/educati on/encyclopedia/ocean-trench/?ar_a=1 ...
Reading
... Subduction zones occur at some convergent boundaries. When a plate carrying oceanic crust collides with a plate carrying continental crust, subduction occurs. Ocean crust, which is denser than continental crust, sinks beneath the continental crust forming a deep ocean trench. As the trench is formed ...
... Subduction zones occur at some convergent boundaries. When a plate carrying oceanic crust collides with a plate carrying continental crust, subduction occurs. Ocean crust, which is denser than continental crust, sinks beneath the continental crust forming a deep ocean trench. As the trench is formed ...
Plates are large rigid slabs on Earth`s surface. Interact at boundaries
... spreading, this occurs at the center of the oceanic ridge system: the largest mountain range in the world. Plates grow where this sea floor spreading occurs. Plates can grow if other areas have plates shrinking. This occurs at subduction zones, where there are convergent boundaries, characteriz ...
... spreading, this occurs at the center of the oceanic ridge system: the largest mountain range in the world. Plates grow where this sea floor spreading occurs. Plates can grow if other areas have plates shrinking. This occurs at subduction zones, where there are convergent boundaries, characteriz ...
Name: 1) The primary cause of convection currents in the Earth`s
... Questions 17 through 21 refer to the following: Diagram I below is a map showing the location and bedrock age of some of the Hawaiian Islands. Diagram II is a cross section of an area of the Earth illustrating a stationary magma source and the process that could have formed the islands. ...
... Questions 17 through 21 refer to the following: Diagram I below is a map showing the location and bedrock age of some of the Hawaiian Islands. Diagram II is a cross section of an area of the Earth illustrating a stationary magma source and the process that could have formed the islands. ...
Volcanoes
... • A volcano is a weak spot in Earth’s crust where magma is able to come through and reach the surface. • Magma is a combination of molten (melted) rock, gases and water. • Once it reaches the surface it is called lava. This does not mean the substance has changed, it hasn’t. It just means it has rea ...
... • A volcano is a weak spot in Earth’s crust where magma is able to come through and reach the surface. • Magma is a combination of molten (melted) rock, gases and water. • Once it reaches the surface it is called lava. This does not mean the substance has changed, it hasn’t. It just means it has rea ...
Document
... How do these stresses cause brittle & ductile deformation on all scales in crustal rocks? ...
... How do these stresses cause brittle & ductile deformation on all scales in crustal rocks? ...
Lecture 8: Plate Boundaries
... Collisions (closing of basins) mediate accretion Losses only from weathering and subduction of sediment ...
... Collisions (closing of basins) mediate accretion Losses only from weathering and subduction of sediment ...
INTERNAL STRUCTURE OF THE EARTH AND PLATE TECTONICS
... Inner core (1,300 km dia.) • Mostly iron (90%); Some Ni, S, and O Outer core (2,000 km dia.) • Liquid similar in composition to inner core • Densities of inner and outer cores about same =10.7 g/cm 3 Earth's average density; ~5.5 g/cm3 ...
... Inner core (1,300 km dia.) • Mostly iron (90%); Some Ni, S, and O Outer core (2,000 km dia.) • Liquid similar in composition to inner core • Densities of inner and outer cores about same =10.7 g/cm 3 Earth's average density; ~5.5 g/cm3 ...
Learning Assessment #1
... On your cross section, clearly label all the features indicated in the legend using the symbols provided with the handout. Also make sure that on your cross section you have labeled or indicated the following: • The names of the tectonic plates (place the name label them above the cross section and ...
... On your cross section, clearly label all the features indicated in the legend using the symbols provided with the handout. Also make sure that on your cross section you have labeled or indicated the following: • The names of the tectonic plates (place the name label them above the cross section and ...
Exam 1
... -know the difference between oceanic crust & continental crust -know how pressure and temperature change as you move through the layers of the earth and their effects on the behavior of rocks -know the internal source of heat inside the earth and how heat moves by conduction or convection -know how ...
... -know the difference between oceanic crust & continental crust -know how pressure and temperature change as you move through the layers of the earth and their effects on the behavior of rocks -know the internal source of heat inside the earth and how heat moves by conduction or convection -know how ...
Review for the Plate Tectonics and Structure of the Earth Test
... seismic activity (earthquakes), volcanism, and mountain building occur along the margins of these plates. A major difference between plate tectonics and continental drift is that large plates contain both continental and ocean crust and the entire plate moves. In continental drift, Wegener propose ...
... seismic activity (earthquakes), volcanism, and mountain building occur along the margins of these plates. A major difference between plate tectonics and continental drift is that large plates contain both continental and ocean crust and the entire plate moves. In continental drift, Wegener propose ...
Benchmark 3 Answer Key
... 13. What geological features are created at convergent boundaries? Mountains (2 continental plates), trenches (oceanic and oceanic plate), volcanoes (continental and oceanic plate) 14. What geological features are created at divergent boundaries? Sea floor spreading- makes mid ocean ridges (2 oceani ...
... 13. What geological features are created at convergent boundaries? Mountains (2 continental plates), trenches (oceanic and oceanic plate), volcanoes (continental and oceanic plate) 14. What geological features are created at divergent boundaries? Sea floor spreading- makes mid ocean ridges (2 oceani ...
Earth`s interio
... – rigid uppermost part of mantle plus crust – tectonic plates – Average thickness of 100 Km. • Asthenosphere ...
... – rigid uppermost part of mantle plus crust – tectonic plates – Average thickness of 100 Km. • Asthenosphere ...
Name: Date:______ Period:______ Lab – Sea Floor Spreading
... Introduction: Sea floor spreading is the hypothesis that the sea floor moves sideways away from the mid ocean ridge. The two sides of the ridge are moving in opposite directions leaving a rift valley that is the site of submarine volcanic eruptions. Molten rock from a magma chamber only 1 to 2 kilom ...
... Introduction: Sea floor spreading is the hypothesis that the sea floor moves sideways away from the mid ocean ridge. The two sides of the ridge are moving in opposite directions leaving a rift valley that is the site of submarine volcanic eruptions. Molten rock from a magma chamber only 1 to 2 kilom ...
Plate Tectonics
... Accretion of dust in space due to GRAVITATIONAL FORCES – Dust – Asteroids – Planets 1. accretion of Heavy elements 2. attraction of Light gases to dense nucleus ...
... Accretion of dust in space due to GRAVITATIONAL FORCES – Dust – Asteroids – Planets 1. accretion of Heavy elements 2. attraction of Light gases to dense nucleus ...
Chapter 7:2 pages 198-201
... 2. It wasn’t until many years later that evidence provided some clues to the forces that moved the continents. ...
... 2. It wasn’t until many years later that evidence provided some clues to the forces that moved the continents. ...
Key concepts
... continental slope, continental rise) -know what factors affect continental shelf width -knoe that turbidity currents formed submarine canyons -know what oceanic ridges are and the process occurring at them (including occurrence of transform faults) -be able to describe the formation of hydrothermal ...
... continental slope, continental rise) -know what factors affect continental shelf width -knoe that turbidity currents formed submarine canyons -know what oceanic ridges are and the process occurring at them (including occurrence of transform faults) -be able to describe the formation of hydrothermal ...
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.