triple junction
... ocean basins that displaced water onto the continents. The Cretaceous was also a time of rapid sea-floor spreading. Because of their broad profile, rapidly spreading mid-ocean ridges displace more water than do slow spreading mid-ocean ridges. Consequently, during times of rapid sea-floor spreading, ...
... ocean basins that displaced water onto the continents. The Cretaceous was also a time of rapid sea-floor spreading. Because of their broad profile, rapidly spreading mid-ocean ridges displace more water than do slow spreading mid-ocean ridges. Consequently, during times of rapid sea-floor spreading, ...
CONSTRUCTING A SEA-FLOOR SPREADING MODEL
... PURPOSE: To demonstrate processes and features at mid-ocean ridges and at trenches. BACKGROUND INFORMATION: ...
... PURPOSE: To demonstrate processes and features at mid-ocean ridges and at trenches. BACKGROUND INFORMATION: ...
How and Where Earthquakes Occur
... of a meteor. The cause of most major earthquakes is the strain that builds up along faults at or near boundaries between lithospheric plates. A fault is a break in the lithosphere along which movement has occurred. Most of the time, friction prevents the plates from moving, so strain builds up, caus ...
... of a meteor. The cause of most major earthquakes is the strain that builds up along faults at or near boundaries between lithospheric plates. A fault is a break in the lithosphere along which movement has occurred. Most of the time, friction prevents the plates from moving, so strain builds up, caus ...
Volcanoes and Igneous Activity Earth
... An earthquake is the vibration of Earth produced by the rapid release of energy Energy released radiates in all directions from its source, (focus ) Energy is in the form of waves Sensitive instruments around the world record the event ...
... An earthquake is the vibration of Earth produced by the rapid release of energy Energy released radiates in all directions from its source, (focus ) Energy is in the form of waves Sensitive instruments around the world record the event ...
The Inside of Earth: Deep-Earth Science from the Top Down
... decks of suspension bridges work the same way: take away the lateral compression and they fall apart. Continents are part of the lithosphere. The continents break up and reassemble every 400 or 500 million years or so. About 750 million years ago, Earth’s continental fragments were assembled as a su ...
... decks of suspension bridges work the same way: take away the lateral compression and they fall apart. Continents are part of the lithosphere. The continents break up and reassemble every 400 or 500 million years or so. About 750 million years ago, Earth’s continental fragments were assembled as a su ...
activity 1
... In 1915 ............................................. first proposed the theory of .................................................. . He hypothesized that there was a gigantic supercontinent 200 million years ago (...........................) surrounded by a gigantic ocean (....................... ...
... In 1915 ............................................. first proposed the theory of .................................................. . He hypothesized that there was a gigantic supercontinent 200 million years ago (...........................) surrounded by a gigantic ocean (....................... ...
Pliocene to Present-day stress field along the western Gibraltar
... of the authors agree that the eastward subduction and the back-arc extension were mainly operating during the Early and Middle Miocene, their continuity since the Upper Miocene and the present-day activity/inactivity is under a vigorous debate. We present a new set of brittle microtectonic measureme ...
... of the authors agree that the eastward subduction and the back-arc extension were mainly operating during the Early and Middle Miocene, their continuity since the Upper Miocene and the present-day activity/inactivity is under a vigorous debate. We present a new set of brittle microtectonic measureme ...
Lecture 6: Igneous Rocks (Melting and Differentiation) Oct. 4, 2006
... therefore the melting process producing rhyolites presumably not in mantle andesites occur both in continental and oceanic areas but in oceanic setting, they are largely confined to areas near trenches andesite line in the Pacific thus, melting process seems to involve mantle but with link to subduc ...
... therefore the melting process producing rhyolites presumably not in mantle andesites occur both in continental and oceanic areas but in oceanic setting, they are largely confined to areas near trenches andesite line in the Pacific thus, melting process seems to involve mantle but with link to subduc ...
Earthquakes
... Stress- a force (energy) that acts on rock to change its shape or volume Types of Stress Tension- pulls or stretches rock so that it becomes thinner in the middle. This happens at divergent plate boundaries. Compression- squeezes rock until it folds or breaks. This happens at convergent plate bounda ...
... Stress- a force (energy) that acts on rock to change its shape or volume Types of Stress Tension- pulls or stretches rock so that it becomes thinner in the middle. This happens at divergent plate boundaries. Compression- squeezes rock until it folds or breaks. This happens at convergent plate bounda ...
Powerpoint Presentation Physical Geology, 10/e
... indicated polar wandering, potential evidence for continental drift over time • Continental drift hypothesis initially ...
... indicated polar wandering, potential evidence for continental drift over time • Continental drift hypothesis initially ...
Document
... 27. Describe the rock that forms when magma cools to form new oceanic lithosphere. _______________________________________________________________ _______________________________________________________________ 28. A narrow area that forms where the plates at a divergent boundary separate is called ...
... 27. Describe the rock that forms when magma cools to form new oceanic lithosphere. _______________________________________________________________ _______________________________________________________________ 28. A narrow area that forms where the plates at a divergent boundary separate is called ...
Kenny Nielsen - Kenny`s Website
... crust (subduction) the continental crust is pushed up. This can create mountains, or volcanoes. These two almost work as a team to create each other. The relationship between these two always comes back to the shifting of the plates. The heating of the earth’s core casing both to distribute natural ...
... crust (subduction) the continental crust is pushed up. This can create mountains, or volcanoes. These two almost work as a team to create each other. The relationship between these two always comes back to the shifting of the plates. The heating of the earth’s core casing both to distribute natural ...
earthquakes - SCHOOLinSITES
... As tectonic plates push, pull or slip past each other, stress increases along faults near the plate’s edges. This causes the rock to deform What is deformation? It is the change in the shape of rock in response to stress. How many ways does a rock deform? Two In a plastic manner or in an elastic man ...
... As tectonic plates push, pull or slip past each other, stress increases along faults near the plate’s edges. This causes the rock to deform What is deformation? It is the change in the shape of rock in response to stress. How many ways does a rock deform? Two In a plastic manner or in an elastic man ...
Earthquakes and Plate Boundaries
... • Shallow earthquakes occur along divergent plate boundaries, like mid-ocean ridges • Shallow earthquakes also occur along transform boundaries • Along continental convergent boundaries, earthquakes of varying depths occur ...
... • Shallow earthquakes occur along divergent plate boundaries, like mid-ocean ridges • Shallow earthquakes also occur along transform boundaries • Along continental convergent boundaries, earthquakes of varying depths occur ...
How The Earth Was Made: YELLOWSTONE
... 17. mountain ranges on the sea floor where divergent boundaries come apart 18. solid layer of the core 21. the plastic like layer of the mantle below the lithosphere 23. brittle layer of earth consisting of the crust and the upper portion of the mantle ...
... 17. mountain ranges on the sea floor where divergent boundaries come apart 18. solid layer of the core 21. the plastic like layer of the mantle below the lithosphere 23. brittle layer of earth consisting of the crust and the upper portion of the mantle ...
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 ...
Plate Tectonics - Sterlingmontessoriscience
... (2) Ocean crust, formed at divergent margins, is mafic and dense. (3) As ocean crust ages and cools, its great density relative to the continents results in subduction as plates converge. [As a result, old ocean crust cannot persist, whereas old parts of the buoyant continents can survive for eons.] ...
... (2) Ocean crust, formed at divergent margins, is mafic and dense. (3) As ocean crust ages and cools, its great density relative to the continents results in subduction as plates converge. [As a result, old ocean crust cannot persist, whereas old parts of the buoyant continents can survive for eons.] ...
Module 3, Investigation 3: Plate Tectonics Introduction Welcome
... What causes the plates to move? You already know something about the Earth's structure that is the key to making plates move. Can you remember what it is? If not, review your notes from Module 2, Investigation 3, Folder 3: "Voyage to the Center of the Earth". In that investigation, you determined th ...
... What causes the plates to move? You already know something about the Earth's structure that is the key to making plates move. Can you remember what it is? If not, review your notes from Module 2, Investigation 3, Folder 3: "Voyage to the Center of the Earth". In that investigation, you determined th ...
Define and Differentiate Earthquakes and Plate Tectonics Submitted
... troughs that mark where two plates converge, usually along the edge of a continent or island are where andesitic volcanoes typically occur. Earthquakes originate in Benioff zones, zones that slope downward from the trenches and under the overlying rocks at 30 to 60 degrees. Benioff zones are closely ...
... troughs that mark where two plates converge, usually along the edge of a continent or island are where andesitic volcanoes typically occur. Earthquakes originate in Benioff zones, zones that slope downward from the trenches and under the overlying rocks at 30 to 60 degrees. Benioff zones are closely ...
1 Section 4.4 - Sea- Floor Spreading Directions
... 44) On which side of a mid-ocean ridge does sea floor spreading occur? Both sides 45) How does evidence from molten material support sea floor spreading? Rocks farther away from the ridge are older / Rocks near the ridge are younger Indicates that rocks being formed at the ridge are being pushe ...
... 44) On which side of a mid-ocean ridge does sea floor spreading occur? Both sides 45) How does evidence from molten material support sea floor spreading? Rocks farther away from the ridge are older / Rocks near the ridge are younger Indicates that rocks being formed at the ridge are being pushe ...
What Causes EARTHQUAKES?
... caused by a catastrophic event resulting from plate movements and design possible devices or solutions to minimize the effects of that event on Earth’s surface and/or human structures. WHAT IS AN EARTHQUAKE? ______________________ are vibrations produced when rocks break along a _______________. The ...
... caused by a catastrophic event resulting from plate movements and design possible devices or solutions to minimize the effects of that event on Earth’s surface and/or human structures. WHAT IS AN EARTHQUAKE? ______________________ are vibrations produced when rocks break along a _______________. The ...
Sample Exam Geology
... 65. Which one of the following most accurately describes the volcanoes of the Hawaiian Islands? a. stratovolcanoes associated with subduction and a convergent plate boundary b. shield volcanoes fed by a long-lived hot spot below the Pacific lithospheric plate c. shield volcanoes associated with a mi ...
... 65. Which one of the following most accurately describes the volcanoes of the Hawaiian Islands? a. stratovolcanoes associated with subduction and a convergent plate boundary b. shield volcanoes fed by a long-lived hot spot below the Pacific lithospheric plate c. shield volcanoes associated with a mi ...
earthquake
... Cause of Earthquakes Aftershocks and Foreshocks • An aftershock is a small earthquake that follows the main earthquake. • A foreshock is a small earthquake that often precedes a major earthquake. (fore = before) • The San Andreas Fault is the most studied fault system. Small EQs are used to predic ...
... Cause of Earthquakes Aftershocks and Foreshocks • An aftershock is a small earthquake that follows the main earthquake. • A foreshock is a small earthquake that often precedes a major earthquake. (fore = before) • The San Andreas Fault is the most studied fault system. Small EQs are used to predic ...
Chemical geodynamics of helium.
... • Discovery of the survival of Hadean-formed heterogeneities in the Earth (129Xe, 182W) is an exciting development in geochemistry. • How are early-formed heterogeneities preserved in the mantle for >4.5 Ga? • 4 years ago I would have predicted these discoveries were impossible… we do not understand ...
... • Discovery of the survival of Hadean-formed heterogeneities in the Earth (129Xe, 182W) is an exciting development in geochemistry. • How are early-formed heterogeneities preserved in the mantle for >4.5 Ga? • 4 years ago I would have predicted these discoveries were impossible… we do not understand ...
Post-glacial rebound
Post-glacial rebound (sometimes called continental rebound) is the rise of land masses that were depressed by the huge weight of ice sheets during the last glacial period, through a process known as isostatic depression. Post-glacial rebound and isostatic depression are different parts of a process known as either glacial isostasy, glacial isostatic adjustment, or glacioisostasy. Glacioisostasy is the solid Earth deformation associated with changes in ice mass distribution. The most obvious and direct affects of post-glacial rebound are readily apparent in northern Europe (especially Scotland, Estonia, Latvia, Fennoscandia, and northern Denmark), Siberia, Canada, the Great Lakes of Canada and the United States, the coastal region of the US state of Maine, parts of Patagonia, and Antarctica. However, through processes known as ocean siphoning and continental levering, the effects of post-glacial rebound on sea-level are felt globally far from the locations of current and former ice sheets.