Identify the factors that cause magnetic stripes to form along the ocean floor. Select the two correct answers.(1 point)
Responses
Magnetic direction of rock changes as Earth’s magnetic poles drift.
Magnetic direction of rock changes as Earth’s magnetic poles drift.
Plates move as new rock forms, which causes magnetic direction to skew away from normal.
Plates move as new rock forms, which causes magnetic direction to skew away from normal.
Magma acquires the magnetic direction present on Earth when it hardens into rock
Magma acquires the magnetic direction present on Earth when it hardens into rock
Rock forming at the oceanic ridge pushes older rock outward in both directions.
The factors that cause magnetic stripes to form along the ocean floor are:
- Magma acquires the magnetic direction present on Earth when it hardens into rock.
- Rock forming at the oceanic ridge pushes older rock outward in both directions.
These two processes are part of the theory of seafloor spreading and help to create the symmetrical pattern of magnetic stripes on either side of mid-ocean ridges. As new magma rises at the mid-ocean ridges, it cools and solidifies into rock, recording the Earth's magnetic polarity at the time. Over time, as more magma emerges and solidifies, the existing seafloor is pushed away from the ridge, creating a striped pattern of normal and reversed magnetic polarity as the Earth's magnetic field reverses over geological time.