The Ocean Floor
... water, and they form the continental shelves. These shelves slope outward very gently towards the ocean depths. In some places these shelves go out a long way, up to 900 miles: In other places the shelves are much narrower. These shelves are fairly smooth because debris from the land is falling onto ...
... water, and they form the continental shelves. These shelves slope outward very gently towards the ocean depths. In some places these shelves go out a long way, up to 900 miles: In other places the shelves are much narrower. These shelves are fairly smooth because debris from the land is falling onto ...
Plate tectonics/boundaries
... _F- divergent_ 16. A rift valley forms along a convergent boundary on land. F- Pangaea_ 17. The supercontinent that began to break apart about 225 million years ago is called Antarctica. __T_____________ 18. As oceanic crust moves away from the midocean ridge, it cools and becomes more dense. _T____ ...
... _F- divergent_ 16. A rift valley forms along a convergent boundary on land. F- Pangaea_ 17. The supercontinent that began to break apart about 225 million years ago is called Antarctica. __T_____________ 18. As oceanic crust moves away from the midocean ridge, it cools and becomes more dense. _T____ ...
Lesson 5: Coral Reefs and the Open Ocean - Florida 4-H
... area of water over the continental slope and rise to a depth of 2,000 meters. This zone is regarded as a geologically active area with underwater avalanches and slides. In the upper regions of the bathyal zone, the dim light forms an area sometimes referred to as the twilight zone. Only about 1 per ...
... area of water over the continental slope and rise to a depth of 2,000 meters. This zone is regarded as a geologically active area with underwater avalanches and slides. In the upper regions of the bathyal zone, the dim light forms an area sometimes referred to as the twilight zone. Only about 1 per ...
Lesson 5 - Florida 4-H
... area of water over the continental slope and rise to a depth of 2,000 meters. This zone is regarded as a geologically active area with underwater avalanches and slides. In the upper regions of the bathyal zone, the dim light forms an area sometimes referred to as the twilight zone. Only about 1 per ...
... area of water over the continental slope and rise to a depth of 2,000 meters. This zone is regarded as a geologically active area with underwater avalanches and slides. In the upper regions of the bathyal zone, the dim light forms an area sometimes referred to as the twilight zone. Only about 1 per ...
Chapter 10 Worksheet
... i. A broad area of continental crust that has been thinned and overlain by marine sediments. j. Formed by bending down of a slab as it enters a subduction zone. ...
... i. A broad area of continental crust that has been thinned and overlain by marine sediments. j. Formed by bending down of a slab as it enters a subduction zone. ...
Continental Margins and Ocean Basins
... Covers about 30% of Earth’s surface Begins at base of continental rise Sedimentation: Passive and turbidity currents Contain abyssal plains, deep sea trenches, and seamounts ...
... Covers about 30% of Earth’s surface Begins at base of continental rise Sedimentation: Passive and turbidity currents Contain abyssal plains, deep sea trenches, and seamounts ...
Dynamic Ocean Floor
... • Two plates move away from one another. • This is a zone of weakness. • As two plates move apart at the mid-ocean ridges, magma from the mantle up wells through a crack in the oceanic crust and cooled by the sea creating new ocean floor. • Energy is released in the form of earthquakes. • Shallow fo ...
... • Two plates move away from one another. • This is a zone of weakness. • As two plates move apart at the mid-ocean ridges, magma from the mantle up wells through a crack in the oceanic crust and cooled by the sea creating new ocean floor. • Energy is released in the form of earthquakes. • Shallow fo ...
Sea-Floor Spreading
... • The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again is called subduction. • As subduction occurs, crust closer to a mid-ocean ridge moves away from the ridge and toward a deep-ocean trench. • Sea-floor spreading and subduction often work together. ...
... • The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again is called subduction. • As subduction occurs, crust closer to a mid-ocean ridge moves away from the ridge and toward a deep-ocean trench. • Sea-floor spreading and subduction often work together. ...
Plate Tectonics Crossword - www .alexandria .k12 .mn .us
... 1. The primary force that causes the seafloor to spread and continents to drift. (Hint: Starts with a “ T ”… See also #13 down clue) 2. Plate _____________. 4. ______________ zones. Places where the seafloor is forced under continental ...
... 1. The primary force that causes the seafloor to spread and continents to drift. (Hint: Starts with a “ T ”… See also #13 down clue) 2. Plate _____________. 4. ______________ zones. Places where the seafloor is forced under continental ...
Continental Drift, Mountain Building, and Plate Tectonics
... Magnetic minerals (mainly magnetite) is magnetized and aligned with earth’s mag. Field below the CURIE POINT. These fossil magnets reflect changes in the magnetic field through time. INCLINATION is the angle the magnetic makes with the earth’s surface = latitiude DECLINATION is the angle between the ...
... Magnetic minerals (mainly magnetite) is magnetized and aligned with earth’s mag. Field below the CURIE POINT. These fossil magnets reflect changes in the magnetic field through time. INCLINATION is the angle the magnetic makes with the earth’s surface = latitiude DECLINATION is the angle between the ...
oceanic crust - Science by Shaw
... Friday: Quiz, Notes on Seafloor Features, Work Deep Ocean Animal Project Monday: Continue Seafloor Features, Work on Deep Ocean Animal Project Tuesday: Review, Work on Deep Ocean Animal Project Wednesday: TEST on unit 3 ...
... Friday: Quiz, Notes on Seafloor Features, Work Deep Ocean Animal Project Monday: Continue Seafloor Features, Work on Deep Ocean Animal Project Tuesday: Review, Work on Deep Ocean Animal Project Wednesday: TEST on unit 3 ...
Marks`s powerpoint presentation (as a pdf), 0
... Earthquakes beneath the Pacific Ocean occurred at shallow depths. Earthquakes beneath Siberia and China occurred at greater depths. After World War II, H. Benioff observed the same distribution of earthquakes but could not offer a plausible explanation. ...
... Earthquakes beneath the Pacific Ocean occurred at shallow depths. Earthquakes beneath Siberia and China occurred at greater depths. After World War II, H. Benioff observed the same distribution of earthquakes but could not offer a plausible explanation. ...
Features of the Ocean Basins
... continental crust and oceanic crust - The average angle displayed by the slope is about 5 degrees. ...
... continental crust and oceanic crust - The average angle displayed by the slope is about 5 degrees. ...
Plate Tectonics Study Guide
... 3. What was Alfred Wegener’s Theory? That all the continents were once connected in a supercontinent called Pangaea 4. What evidence is there to support Wegener’s theory? List 3 things. 1. Fossils 2. Land Features 3. Climate change 5. Where do we find evidence of sea-floor spreading? At mid-ocean ri ...
... 3. What was Alfred Wegener’s Theory? That all the continents were once connected in a supercontinent called Pangaea 4. What evidence is there to support Wegener’s theory? List 3 things. 1. Fossils 2. Land Features 3. Climate change 5. Where do we find evidence of sea-floor spreading? At mid-ocean ri ...
Notes_-_Earths_Layers
... Chemical composition: rocks rich in iron and magnesium silicates Common rock types: basalt, obsidian, gabbro Rocks are more dense, darker in color than continental crust Mantle Lies underneath the crust 2900 Km thick The lithosphere is a zone made of the upper mantle and entire crust. It ...
... Chemical composition: rocks rich in iron and magnesium silicates Common rock types: basalt, obsidian, gabbro Rocks are more dense, darker in color than continental crust Mantle Lies underneath the crust 2900 Km thick The lithosphere is a zone made of the upper mantle and entire crust. It ...
Development of the Theory of Plate Tectonics
... In the 1960s, Harry Hess used data collected to suggest the theory of seafloor spreading to explain the ridges. He explained that: 1. Hot, less dense material below Earth’s crust rises upward to the surface at the midocean ridges. 2. Then, it flows sideways, carrying the seafloor away from the ridge ...
... In the 1960s, Harry Hess used data collected to suggest the theory of seafloor spreading to explain the ridges. He explained that: 1. Hot, less dense material below Earth’s crust rises upward to the surface at the midocean ridges. 2. Then, it flows sideways, carrying the seafloor away from the ridge ...
Document
... Juan de Fuca plate. Spreading and subduction Mt St Helens is part of the Cascade Arc Volcanoes ...
... Juan de Fuca plate. Spreading and subduction Mt St Helens is part of the Cascade Arc Volcanoes ...
The stability of the continents and the tendency for old oceanic
... Problem set #3. Isostasy and Ridge Push (Due in class on May 6) A. Why do only oceans get subducted? ...
... Problem set #3. Isostasy and Ridge Push (Due in class on May 6) A. Why do only oceans get subducted? ...
– Circle the response that best answers the question.
... 13 The single landmass that broke apart 250 million years ago was Pangaea. 14 Mid-ocean ridges are places where oceanic crust sinks back to the mantle. 15 When two continental plates diverge, a transform boundary forms. ...
... 13 The single landmass that broke apart 250 million years ago was Pangaea. 14 Mid-ocean ridges are places where oceanic crust sinks back to the mantle. 15 When two continental plates diverge, a transform boundary forms. ...
jeopardyplatetech Answer Key
... What are the large, brittle pieces of Earth's outer shell called? Plate Tectonics includes ideas from which two theories that we have been studying? What is it called when a lithospheric plate sinks into the mantle? What is the area around the Pacific ocean that has a lot of volcanic activity due ...
... What are the large, brittle pieces of Earth's outer shell called? Plate Tectonics includes ideas from which two theories that we have been studying? What is it called when a lithospheric plate sinks into the mantle? What is the area around the Pacific ocean that has a lot of volcanic activity due ...
"Inside Earth" Chapter 1 Section 4
... Evidence for Sea-Floor Spreading * Mid-Ocean Ridges are chains of volcanoes that wind around Earth; the system is more than 50,000 km long. Most of the mountains are deep underwater, but the island of Iceland is a part of a mid-ocean ridge. What is Sea-Floor Spreading? * Harry Hess connected mid-oce ...
... Evidence for Sea-Floor Spreading * Mid-Ocean Ridges are chains of volcanoes that wind around Earth; the system is more than 50,000 km long. Most of the mountains are deep underwater, but the island of Iceland is a part of a mid-ocean ridge. What is Sea-Floor Spreading? * Harry Hess connected mid-oce ...
What’s Shakin? - Oklahoma Alliance for Geographic
... What could have happened to make these differences? ...
... What could have happened to make these differences? ...
ES Plate Tectonicv2
... Pieces of outermost, rigid layer of the Earth (lithosphere) that move around on the softer layer of the mantle below (asthenosphere) ...
... Pieces of outermost, rigid layer of the Earth (lithosphere) that move around on the softer layer of the mantle below (asthenosphere) ...
GEOL1033-SQS03R
... ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ________________________________________________ ...
... ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ______________________________________________________________ ________________________________________________ ...
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.