Magnetic Surveys Of The Ocean Floors Reveal

B thin oceanic crust composed of basaltic rocks.

Magnetic surveys of the ocean floors reveal.

Mapping of variation over an area is valuable in detecting structures obscured by overlying material. 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. Plate tectonics states that. To know topography and possible hiding places for submarines.

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. Seafloor is created at mid ocean ridges and destroyed at deep ocean trenches. Alternating stripes of normal and reversed polarity paralleling the mid atlantic ridge. D all of the above.

It is suggested that the entire history of the ocean basins in terms of oceanfloor spreading is contained frozen in the oceanic crust. C that reversed polarity is rare. 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.

Seafloor is created at mid ocean ridges and destroyed at deep ocean trenches. In a reconstruction of earth s geologic past the continents of africa and south america fit best along the. Newly formed mineral grains on the ocean floor are magnetized according to the new orientation of the magnetic field. Alternating stripes of normal and reversed polarity paralleling the mid ocean ridge.

The concept of seafloor spreading states that. Magnetic surveys of the ocean floor reveal. Plate tectonics states that. Salt domes were created when regions in the ocean repeatedly dried out.

Magnetic surveys of the ocean floor reveal. In geophysics a magnetic anomaly is a local variation in the earth s magnetic field resulting from variations in the chemistry or magnetism of the rocks. As hot mantle rises it expands. The concept of seafloor spreading states that.

A seismic survey may make use of both shipboad measurements and measurements from an array of ocean bottom seismometers. Magnetic surveys of the ocean floors reveal a alternating stripes of normal and reversed polarity paralleling the mid atlantic ridge. 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. Features in the seafloor layers indicating that oil and gas might be contained in the rocks include salt domes and seeps.

Alternating stripes of normal and reversed polarity paralleling the mid atlantic ridge. Magnetic surveys of the ocean floor reveal.