As the seafloor spreads apart, magma is forced upward and flows from the cracks. What are the evidences that support the theory of seafloor spreading? SURVEY . They form the upper part of Layer 2 of normal oceanic crust To play this quiz, please finish editing it. of the Juan de Fuca Ridge, is the site of a seafloor spreading episode during the mid-1980s that was originally discovered by the occurrence of anomalous hydrothermal bursts (megaplumes) and later documented by seafloor mapping of new pillow mounds (NPM) that were erupted. Divergent. Magma comes out of ocean ridges as pillow lava and forms a new oceanic crust, supporting sea floor spreading. About Cookies, including instructions on how to turn off cookies if you wish to do so. fBoyle February 2, 2013 . The older crust gets pushed away from the ridge and pushes on to the continents, making them drift. 8. answer choices ... What 3 kinds of evidence were used to prove that the seafloor spread? The first four magnetic periods are: Brunhes normal - present to 730,000 years ago. In 1960, the American geophysicist, Harry Hess explained how the convection currents in the Earth’s interior make the seafloor spread. Convection currents carry heat from the lower mantle and core to the lithosphere. SURVEY. Which is the correct sequence on seafloor spreading 1. The less dense material flows sideways, carrying the seafloor away from the ridge in both directions. Explain at least 2 evidences that Alfred Wegener used to support his hypothesis on continental drift. Abundant evidence supports the major contentions of the seafloor-spreading theory. Evidence for Sea-Floor Spreading In 1968, the Glomar Challenger used special equipment to drill into the ocean floor six kilometers beneath the ocean’s surface. In this article series, we are learning about the theories which explain the present distribution of oceans and continents, the concepts which explain the distribution of earthquakes and volcanoes, folds and faults. The basaltic lavas that make up the oceanic crust contain the magnetic mineral magnetite. Explain what is seafloor spreading. Pillow lavas have pillow-like structures and are formations that push lava on the surface of the earth underwater. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The seafloor spreading hypothesis was based primarily on the magnetic mapping evidence. It was also supported by several additional lines of evidence available at the time including evidence from age dating and bathymetric surveys. Strange rocks shaped like pillows (form only when molten material hardens quickly after … As a result, the ocean floors move like conveyor belts, carrying the continents along with them. Mantle convection is the slow, churning motion of Earth’s mantle. Pillow Lava, magnetic seafloor stripes, age of rocks. Start studying Seafloor Spreading, Plate Tectonics, Continental Drift Test (Ferdig Science). The seafloor splits & spreads apart at a mid-ocean ridge, with lava seeping out of this fissure. 400. Pillow Lava. Explain what is seafloor spreading. As the basaltic lava cools, the magnetic orientation of iron within the magnetite aligns … Convection current carry heat from the molten materials in the mantle and core towards the lithosphere. Then, as new oceanic crust form, it pushes the older crust aside. This new rock is located at the mid-ocean ridges. This idea played a pivotal role in the development of the theory of plate tectonics, which revolutionized geologic thought during the last quarter of the 20th century.. As two tectonic plates slowly separate, molten material rises up from within the mantle to fill the opening. Each pillow expands until it burst, allowing molten material to flow out and form the next pillow. 10. The lava cools to form new seafloor. Seafloor spreading is the process of molten material from the mantle being pushed upward to the surface of the earth and spreading apart, creating new earth. In sea-floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. This is a great evidence that the Biblical story is true because pillow lava can't form on land. The northern portion of the Cleft segment, which is the southernmost segment of the Juan de Fuca Ridge, is the site of a seafloor spreading episode during the mid‐1980s that was originally discovered by the occurrence of anomalous hydrothermal bursts (megaplumes) and later documented by seafloor mapping of new pillow mounds (NPM) that were erupted. answer choices . How is pillow lava evidence of sea-floor spreading? At which boundary do two plates move apart? Pillow lavas are lavas that contain characteristic pillow-shaped structures that are attributed to the extrusion of the lava underwater, or subaqueous extrusion.Pillow lavas in volcanic rock are characterized by thick sequences of discontinuous pillow-shaped masses, commonly up to one meter in diameter. Rift valley. First, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the … By combining magnetic polarity data from rocks on land and on the seafloor with radiometric age dating and fossil ages, scientists came up with a time scale for the magnetic reversals. Click card to see definition . Seafloor Spreading Hypothesis. answer choices. 30 seconds. pillow lavas. Last but not least the third piece of evidence is drilling samples. It moves away from the mid-ocean ridge. Convection currents also “recycle” lithospheric materials back to … answer choices . a. Magma, magnetic strips, drilling sample b. In 1968, a ship named the Glomar Challenger gathered samples from the ocean floor up to 6 kilometers in depth. 400. The hypothesis of seafloor spreading was put forward by H. Harry Hess in 1960.This was a new development that again proved the theory of continental drift. These "pillows" form under water when cold ocean water causes a crust to form on erupting molten material. It becomes lava and cools to form rock. Q. Each pillow expands until it bursts, allowing molten material to flow out and form the next pillow. 400. The lava cools rapidly in the ocean, forming rock structures. This means that Mt. Magnetic stripes. Pillow lava only forms when molten material hardens quickly after erupting underwater. Tap card to see definition . Seafloor Age. Along other plate boundaries, a … List three types of evidence for seafloor spreading. -fossils of the same animals found in different areas - the direction iron in ocean rocks points -the tilt and rotation of the Earth’s axis - the age of different rocks on Earth’s surface - pillow-shaped rocks found in the sea Tags: Question 11 . Remove maintenance message What is fossils, climate, coals, mountain ranges? This forms new oceanic crust at the ridges 2. Pillow lava, age of rocks, WWII shipwrecks. Reasoning Tool - Seafloor Spreading. Click again to see term . Magma that rises through cracks on the seafloor erupts and becomes lava. seafloor. Is the following sentence true or false? Ararat was once submerged in water, so the flood really took place! Age of rocks, magnetic seafloor stripes, WWII ship logs. 6. The magma moves up from the mantle and erupts as pillow lava. Question 1. Explain at least 2 evidences that Alfred Wegener used to support his hypothesis on continental drift. How is pillow lava evidence of sea-floor spreading? Seafloor Spreading is the usual process at work at divergent plate boundaries, leading to the creation of new ocean floor. 12 Questions Show answers. A rift zone volcano is called a mid-ocean ridge. Check all that apply. Yes, also known as seafloor spreading! Pillow lavas have pillow-like structures and are formations that push lava on the surface of the earth underwater. How is pillow lava evidence of sea-floor spreading? What type of boundary occurs when an oceanic plate subducts under a continental crust? My teacher showed us pictures of different types of lava formations in class and pillow lava was one of them. What feature of seafloor is shallow, gradually sloping seabed around the edge of a continent and has a depth less than 200 meters and can be thought of as the submerge edge of a continent? 7. We interpret this to reflect the absence of a well-defined layer of pillow lavas, whose emplacement is hampered by rapid, abundant sedimentation. When the Earth's Magnetic field reverses, evidence for sea-floor spreading is provided by _____. By continuing to browse this site you agree to us using cookies as described in About Cookies.. Magnetic sands. at the mid-ocean ridge. Then, the seafloor spreading continues as a recycling process. Other spreading centers also lack short-wavelength, high-amplitude magnetic anomalies where covered by thick sediments (Andaman Basin, Juan de Fuca Ridge). Seafloor spreading and other tectonic activity processes are the result of mantle convection. This quiz is incomplete! a. Abyssal plain b.Continental shelf c. Continental slope d.Mid- ocean ridge 8. When a divergent boundary occurs on land, it forms a _____ Oceanic. This feat has been compared to using a sharp-ended wire to dig a hole into a sidewalk from the top of the Empire State Building. 400. 30 seconds . Hot, less dense material below Earth's crust rises towards the surface at a mid-ocean ridge. Tags: Question 16 . What evidence supports Hess’s theory of seafloor spreading? 9. Magma comes out of ocean ridges as pillow lava and forms a new oceanic crust, supporting sea floor spreading. Deep ocean trench, mid-ridges, magnetic strips c. Molten materials, magnetic polarity, abyssal plain d. Molten materials, magnetic strips, drilling sample 7. Seafloor spreading, theory that oceanic crust forms along submarine mountain zones and spreads out laterally away from them. pillow lava along the mid-ocean ridge. Tap again to see term . 400. Deep ocean trench. SURVEY . Several field seasons of investigations using sidescan sonar, a deep-tow Explain the evidence for sea-floor spreading (6) Sea-floor spreading is the lateral movement of new oceanic crust away from the mid-ocean ridge and this process links to Wegener’s (1912) Theory of Continental Drift since it determines the movement of the tectonic plates. This forms new oceanic crust at the ridge 11. The older crust gets pushed away from the ridge and pushes on to the continents, making them drift. Which of the following supports the theory of seafloor spreading? This process occurs along divergent plate boundaries at areas called mid-ocean ridges . What is fossils, climate, coals, mountain ranges? Paleomagnetism, the study of magnetism in rocks, provides evidence for seafloor spreading. Scientists were surprised to discover that the normal and reversed magnetic polarity of seafloor basalts creates a pattern of magnetic stripes. Pillow Lava, magnetic seafloor stripes, age of rocks. Q. Sea-floor spreading begins at the. Evidence from Ocean Materia and pillow lava Evidence from Magnetic stripes Evidence from Drilling Samples. Both pillow lavas and sheet flows are important features of oceanic volcanism at mid-ocean ridges. Directions: Use the reasoning tool to explain how the pieces of evidence support the given claim.
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