Tectonic processes
... or two continental plates. When two oceanic plates move apart, magma rises to the sea floor and creates undersea volcanoes. Because the lava is under pressure from the ocean above and is not rich in dissolved gases, eruptions tend to be of a ■■ Figure 2.4: Constructive plate boundary between constan ...
... or two continental plates. When two oceanic plates move apart, magma rises to the sea floor and creates undersea volcanoes. Because the lava is under pressure from the ocean above and is not rich in dissolved gases, eruptions tend to be of a ■■ Figure 2.4: Constructive plate boundary between constan ...
Volcanoes and Plate Tectonics
... deep-ocean trench into the mantle, some of the rock above the subducting plate melts and forms magma. Because the magma is less dense than the surrounding rock, it rises toward the surface. Eventually, the magma breaks through the ocean floor, creating volcanoes.Volcanoes can also form where oceanic ...
... deep-ocean trench into the mantle, some of the rock above the subducting plate melts and forms magma. Because the magma is less dense than the surrounding rock, it rises toward the surface. Eventually, the magma breaks through the ocean floor, creating volcanoes.Volcanoes can also form where oceanic ...
Earth Science 4
... • Be a SKEPTIC, discuss other explanations for these so called pieces of evidence. ...
... • Be a SKEPTIC, discuss other explanations for these so called pieces of evidence. ...
Document
... Plate tectonics Theory Convection currents in the mantle = plates move. Mantle Oceanic crust less dense than continental crust. Just below crust = cold, rigid Collision between oceanic and continental plates Deeper down = hot, can move = subduction and melting Lithosphere Plates cooler at ocean marg ...
... Plate tectonics Theory Convection currents in the mantle = plates move. Mantle Oceanic crust less dense than continental crust. Just below crust = cold, rigid Collision between oceanic and continental plates Deeper down = hot, can move = subduction and melting Lithosphere Plates cooler at ocean marg ...
sea-floor spreading
... In the mid-1900’s, scientists realized that the ocean floor had many mountain ranges similar to those on the continents. ...
... In the mid-1900’s, scientists realized that the ocean floor had many mountain ranges similar to those on the continents. ...
File
... fixed hotspots in the mantle in 1965 he proposed a third type of plate boundary that he called Transform faults or Conservative Plate Boundaries. These faults move past each other horizontally – San Andreas Fault between North America and Pacific plates ...
... fixed hotspots in the mantle in 1965 he proposed a third type of plate boundary that he called Transform faults or Conservative Plate Boundaries. These faults move past each other horizontally – San Andreas Fault between North America and Pacific plates ...
Evidence Supporting Continental Drift
... several inches a year. A widely-held theory that explains these movements is called "plate tectonics." It was developed in the mid 1960s by geophysicists. The term "plate" refers to large rigid blocks of the Earth's surface which appear to move as a unit. These plates may include both oceans and con ...
... several inches a year. A widely-held theory that explains these movements is called "plate tectonics." It was developed in the mid 1960s by geophysicists. The term "plate" refers to large rigid blocks of the Earth's surface which appear to move as a unit. These plates may include both oceans and con ...
9-19 Sea Floor Spreading.notebook
... • In 1925, Germany outfitted a boat and set out for two years to systematically and scientifically look at the oceans. • This expedition was the first use of closely spaced echo sounders to map deep sea topography and the first to reveal the extent of the sea floor's rugged terrain. • The expedition ...
... • In 1925, Germany outfitted a boat and set out for two years to systematically and scientifically look at the oceans. • This expedition was the first use of closely spaced echo sounders to map deep sea topography and the first to reveal the extent of the sea floor's rugged terrain. • The expedition ...
Plate Boundary chart key
... • Volcanoes • Volcanoes erupt Many DestructiveFaults earthquakes earthquakes destroy the crust and buildings that are in the area ...
... • Volcanoes • Volcanoes erupt Many DestructiveFaults earthquakes earthquakes destroy the crust and buildings that are in the area ...
Dynamic Planet
... a) the part of California west of the San Andreas fault that is moving into the Pacific Ocean. b) the period of geologic history that predates modern life forms. c) a rift valley in east Africa where a new ocean is forming. d) the name of a previous supercontinent thought to have broken into several ...
... a) the part of California west of the San Andreas fault that is moving into the Pacific Ocean. b) the period of geologic history that predates modern life forms. c) a rift valley in east Africa where a new ocean is forming. d) the name of a previous supercontinent thought to have broken into several ...
Geography Year 12 Pre-course task
... http://www.geographypods.com/ http://www.geographylwc.org.uk/A/A2/A2tectonics/pdf/a133%20Earthquake.pdf http://www.sd38.bc.ca/~rhammerschmidt/FOV4-0008D3A6/FOV40008D480/S272A32A4.0/%20GFL%20647%20Chile's%202010%20Earthquake%20damage%20and%20recovery%20.pdf http://geography-groby.weebly.com/u ...
... http://www.geographypods.com/ http://www.geographylwc.org.uk/A/A2/A2tectonics/pdf/a133%20Earthquake.pdf http://www.sd38.bc.ca/~rhammerschmidt/FOV4-0008D3A6/FOV40008D480/S272A32A4.0/%20GFL%20647%20Chile's%202010%20Earthquake%20damage%20and%20recovery%20.pdf http://geography-groby.weebly.com/u ...
Semester 1 Review - Lemon Bay High School
... 11. In the mid-twentieth century, oceanographers used what devices to map the ocean floor? 12. The combined ideas of continental drift and seafloor spreading led to which overriding concept? 13. The theory of plate tectonics describes the movement of the lithosphere floating atop which of Earth's la ...
... 11. In the mid-twentieth century, oceanographers used what devices to map the ocean floor? 12. The combined ideas of continental drift and seafloor spreading led to which overriding concept? 13. The theory of plate tectonics describes the movement of the lithosphere floating atop which of Earth's la ...
Towards a better understanding of hot spot volcanism
... towards the east than in the first simulation. Moreover, this more diffuse shearing zone was superimposed on an anomaly of the Earth’s surface classically attributed to an upswelling of the oceanic lithosphere. This anomaly, caused by the upward pressure of the underlying mantle, appears along with ...
... towards the east than in the first simulation. Moreover, this more diffuse shearing zone was superimposed on an anomaly of the Earth’s surface classically attributed to an upswelling of the oceanic lithosphere. This anomaly, caused by the upward pressure of the underlying mantle, appears along with ...
Construction of Earth
... ongoing transformation of the earth system. Understand that we can observe some changes (such as earthquakes and volcanic eruptions) on a human time-scale, but many processes (such as mountain building and plate movements) take place so sporadically or so slowly (over hundreds of millions of years) ...
... ongoing transformation of the earth system. Understand that we can observe some changes (such as earthquakes and volcanic eruptions) on a human time-scale, but many processes (such as mountain building and plate movements) take place so sporadically or so slowly (over hundreds of millions of years) ...
Earth and Environmental Science Review with Answers
... Similar fossils on different continents, ancient climates, similar rock forms and types, and puzzle piece shapes of the continents 19. Describe the theory of plate tectonics. Plate tectonics says that the crust and upper mantle are broken into plates which “float” on top of the molten layer of the l ...
... Similar fossils on different continents, ancient climates, similar rock forms and types, and puzzle piece shapes of the continents 19. Describe the theory of plate tectonics. Plate tectonics says that the crust and upper mantle are broken into plates which “float” on top of the molten layer of the l ...
spirit 2 - CEENBoT / TekBot Site
... Plate tectonics is the motion of the outer part of the earth called the lithosphere. The lithosphere is comprised of the earth’s crust and upper part of the mantel. Currently, it is thought that there are 8 major plates and many minor plates that are moving across the surface of the earth. The cause ...
... Plate tectonics is the motion of the outer part of the earth called the lithosphere. The lithosphere is comprised of the earth’s crust and upper part of the mantel. Currently, it is thought that there are 8 major plates and many minor plates that are moving across the surface of the earth. The cause ...
Worksheet as a MS Word file ( format)
... After WWII, seafloor mapping by oceanographers showed the existence of a global network of mid-ocean ridges Later work showed that the ridges were formed by long chains of active undersea volcanoes, literally thousands of them -- forming a continuous feature on the seafloor from one ocean basin ...
... After WWII, seafloor mapping by oceanographers showed the existence of a global network of mid-ocean ridges Later work showed that the ridges were formed by long chains of active undersea volcanoes, literally thousands of them -- forming a continuous feature on the seafloor from one ocean basin ...
expedition 8 worksheet as a pdf
... • After WWII, seafloor mapping by oceanographers showed the existence of a global network of mid-ocean ridges • Later work showed that the ridges were formed by long chains of active undersea volcanoes, literally thousands of them -- forming a continuous feature on the seafloor from one ocean basin ...
... • After WWII, seafloor mapping by oceanographers showed the existence of a global network of mid-ocean ridges • Later work showed that the ridges were formed by long chains of active undersea volcanoes, literally thousands of them -- forming a continuous feature on the seafloor from one ocean basin ...
The Face of Change
... element on earth moves among reservoirs in the solid earth, oceans, atmosphere, and organisms as part of geochemical cycles. Movement of matter between reservoirs is driven by the earth's internal and external sources of energy. These movements are often accompanied by a change in the physical and ...
... element on earth moves among reservoirs in the solid earth, oceans, atmosphere, and organisms as part of geochemical cycles. Movement of matter between reservoirs is driven by the earth's internal and external sources of energy. These movements are often accompanied by a change in the physical and ...
Mesozoic Plate Tectonics
... At the end of the Paleozoic, there was one continent and one ocean. Then Pangaea began to break apart about 180 million years ago. The Panthalassa Ocean separated into the individual but interconnected oceans that we see today on Earth. Continental rifting and then seafloor spreading pushed Africa a ...
... At the end of the Paleozoic, there was one continent and one ocean. Then Pangaea began to break apart about 180 million years ago. The Panthalassa Ocean separated into the individual but interconnected oceans that we see today on Earth. Continental rifting and then seafloor spreading pushed Africa a ...
PowerPoint
... • The theory of plate tectonics states that the lithosphere is divided into 12 large sections (plates) and about 20 smaller ones. • These plates ‘float’ on the more dense, fluid-like asthenosphere ...
... • The theory of plate tectonics states that the lithosphere is divided into 12 large sections (plates) and about 20 smaller ones. • These plates ‘float’ on the more dense, fluid-like asthenosphere ...
![Plate Tectonics [ LPI USRA PPT ]](http://s1.studyres.com/store/data/008389422_1-8eb60bbf7443469c34d05e395e64dad1-300x300.png)
Plate Tectonics [ LPI USRA PPT ]
... 7 Plate teams (one specialist per): North American, South American, Indian, Pacific, ...
... 7 Plate teams (one specialist per): North American, South American, Indian, Pacific, ...
Quakes and Plates - COSEE-SE
... would cross both the continent and the ocean. Label this line as A-A’ (one end of the line is A and the other end is A’). ...
... would cross both the continent and the ocean. Label this line as A-A’ (one end of the line is A and the other end is A’). ...
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.