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Igneous rocks on the ocean floor that have an alternating pattern of magnetic orientation provide evidence that?
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Is there evidence that sea floor spreading really happens?
The evidence exists in the extrusive igneous rock, basalt, on the ocean floor near the mid-oceanic ridges. The magnetic orientation of the Earth is recorded in the igneous rock at the time of its formation. The orientation of Earth's magnetic field changes over time, and thus provides a way to relatively date rocks. These orientations can be recorded and mapped with the aid of a magnetometer. Magnetic orientation of oceanic crustal rocks on one side of the mid-oceanic ridge appear as mirror images to the magnetic orientation of oceanic crustal rocks on the other side, meaning that the seafloor is spreading in opposite directions from the rift zone over time. Modern instruments have measured the movement of crust away from the rift zone and it roughly approximates the rate of human fingernail growth.
How is magnetic evidence preserved in the rocks that form along an ocean ridge?
Iron minerals that are present in magma or lava along the ridge that has not completely crystallized into rock are aligned with the Earth's polarity. When the magma or lava cools and solidifies completely, the magnetic orientation of the Earth at that time is preserved in the body of igneous rock.
Which statement provides evidence that the seafloor is spreading out from both sides of the Mid-Atlantic Ridge?
parrell strips of igneous rocks on each side of the ridge show matching reversal of magnetic polity
What is Best evidence of the environment in which an igneous rock was formed?
Texture
What provides the best evidence of the environments in which an igneous rock was formed?
texture
Is there evidence that sea floor spreading really happens?
The evidence exists in the extrusive igneous rock, basalt, on the ocean floor near the mid-oceanic ridges. The magnetic orientation of the Earth is recorded in the igneous rock at the time of its formation. The orientation of Earth's magnetic field changes over time, and thus provides a way to relatively date rocks. These orientations can be recorded and mapped with the aid of a magnetometer. Magnetic orientation of oceanic crustal rocks on one side of the mid-oceanic ridge appear as mirror images to the magnetic orientation of oceanic crustal rocks on the other side, meaning that the seafloor is spreading in opposite directions from the rift zone over time. Modern instruments have measured the movement of crust away from the rift zone and it roughly approximates the rate of human fingernail growth.
How is magnetic evidence preserved in the rocks that form along an ocean ridge?
Iron minerals that are present in magma or lava along the ridge that has not completely crystallized into rock are aligned with the Earth's polarity. When the magma or lava cools and solidifies completely, the magnetic orientation of the Earth at that time is preserved in the body of igneous rock.
What provides the most evidence for the theory of plate tectonics?
Faults and volcanoes are often found at tectonic plates boundaries
How can you decide if a rock is sedimentary igneous or metamorphic?
igneous is black and smooth metamorphic is magnetic and sedimentary is used as cement
Which statement provides evidence that the seafloor is spreading out from both sides of the Mid-Atlantic Ridge?
parrell strips of igneous rocks on each side of the ridge show matching reversal of magnetic polity
How do rocks record the changes in the Earth's magnetic field?
When new seafloor is created by upwelling magma at the mid-ocean ridges, the magnetic minerals orient themselves to the magnetic orientation of Earth at the time of their solidification in the rock matrix. Thus, the history of magnetic reversals are recorded in the rock.
How is the polarity of Earth's magnetic field recorded in the sea floor?
The polarity of the Earth's magnetic field is recorded in igneous rocks, and reversals.
What is Best evidence of the environment in which an igneous rock was formed?
Texture
Describe how the polarity of earth's magnetic field is recorded in the sea-floor?
The polarity of the Earth's magnetic field is recorded in igneous rocks, and reversals.
Which provides the best evidence of the environment in which an igneous rock was formed?
Texture
What provides the best evidence of the environment in which an igneous rock formed?
texture
What provides the best evidence of the environments in which an igneous rock was formed?
texture
