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The bathymetric map when combined with the other three maps serves as a base for making geological geophysical studies of the oceans bottom s crustal geophysical data for the continental shelf.
Magnetic surveys of the ocean floors reveal. Magnetic surveys of the ocean floors reveal alternating strips of normal and reversed polarity paralleling the mid atlantic ridge divergent boundaries are areas of. C that reversed polarity is rare. Features in the seafloor layers indicating that oil and gas might be contained in the rocks include salt domes and seeps. B thin oceanic crust composed of basaltic rocks.
It is suggested that the entire history of the ocean basins in terms of oceanfloor spreading is contained frozen in the oceanic crust. Alternating stripes of normal and reversed polarity paralleling the mid atlantic ridge. The concept of seafloor spreading states that. Seafloor is created at mid ocean ridges and destroyed at deep ocean trenches.
Seafloor is created at mid ocean ridges and destroyed at deep ocean trenches. Plate tectonics states that. Magnetic surveys of the ocean floor reveal. Magnetic surveys of the ocean floors reveal.
Magnetic surveys of the ocean floor reveal. D all of the above. Each consist of three sheets a base bathymetric map a magnetic map and a gravity map and where practicable a sediment overprint nos 1308n 17s. Alternating stripes of normal and reversed polarity paralleling the mid atlantic ridge.
Newly formed mineral grains on the ocean floor are magnetized according to the new orientation of the magnetic field. Magnetic surveys of the ocean floors reveal a alternating stripes of normal and reversed polarity paralleling the mid atlantic ridge. In a reconstruction of earth s geologic past the continents of africa and south america fit best along the. Magnetic surveys of the ocean floor reveal.
Salt domes were created when regions in the ocean repeatedly dried out. As it expands it cools. To know topography and possible hiding places for submarines. Mapping of variation over an area is valuable in detecting structures obscured by overlying material.
Plate tectonics states that. Variations in the intensity and polarity of earth s magnetic field are considered to be recorded in the remanent magnetism of the igneous rocks as they solidified and cooled through the curie temperature at the crest of an oceanic ridge and subsequently. The magnetic variation in successive bands of ocean floor parallel with mid ocean ridges is important evidence supporting the theory of. The concept of seafloor spreading states that.
Alternating stripes of normal and reversed polarity paralleling the mid ocean ridge. Why is it so important to survey the ocean floors.
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