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Which statement provides evidence that the seafloor is spreading out from both sides of the Mid-Atlantic Ridge?
The presence of alternating magnetic stripes on either side of the Mid-Atlantic Ridge provides evidence that the seafloor is spreading out. As magma solidifies to form new oceanic crust, it records the Earth's magnetic field. These magnetic stripes mirror each other on either side of the ridge, indicating a symmetric pattern of seafloor spreading.
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 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
Which statement provides evidence that the seafloor is spreading out from both sides of the Mid-Atlantic Ridge?
The presence of alternating magnetic stripes on either side of the Mid-Atlantic Ridge provides evidence that the seafloor is spreading out. As magma solidifies to form new oceanic crust, it records the Earth's magnetic field. These magnetic stripes mirror each other on either side of the ridge, indicating a symmetric pattern of seafloor spreading.
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.
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
Describe how the polarity of earth's magnetic field is recorded in the sea-floor?
Magnetic minerals in the Earth's crust align with the planet's magnetic field at the time of their formation. When new oceanic crust is created at mid-ocean ridges, these minerals record the direction of the Earth's magnetic field on the sea-floor. This creates alternating stripes of normal and reversed polarity as the sea-floor spreads.
Which provides the best evidence of the environment in which an igneous rock was formed?
The texture and mineral composition of the igneous rock provide key evidence of the environment in which it was formed. Additionally, the presence of features such as vesicles (gas bubbles), crystal size, and orientation can also offer clues about the conditions of formation. Chemical analysis and the rock's relationship to surrounding geological features can also provide valuable information.
What is Best evidence of the environment in which an igneous rock was formed?
Texture
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.
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.
What provides the best evidence of the environments in which an igneous rock was formed?
texture
What provides the best evidence of the environment in which an igneous rock formed?
texture
What is the term for an igneous pluton that occurs in an orientation that is discordant with the bedding surfaces of adjacent sedimentary rocks?
it is called a 'dike'
