Question

question 8 (5 points) what process is responsible for creating magnetic changes along mid - ocean ridges? a) reversal of earths magnetic field b) seafloor spreading c) ridge push d) slab pull

Explanation:

1. For the question about P - waves:

• P - waves are primary seismic waves. They travel faster than S - waves. They can move through solids, liquids, and gases. They move particles in the direction of wave propagation (compression - rarefaction), not up and down or side to side (that's S - waves). So, all the statements in the first set of options are false.

1. For the question about magnetic changes along mid - ocean ridges:

• Seafloor spreading occurs at mid - ocean ridges. As new oceanic crust is formed during seafloor spreading, the magnetic minerals in the cooling magma align with the Earth's magnetic field at that time. When the Earth's magnetic field reverses, the newly formed crust records this reversed polarity. This leads to magnetic striping and magnetic changes along mid - ocean ridges.

Answer:

For the first question: None of the above (since all options A - D are incorrect statements about P - waves).
For the second question: A. Reversal of Earth's magnetic field