Rocks become magnetic when(1 point)
Responses
Earth's magnetic field reverses direction.
Earth's magnetic field reverses direction.
iron particles within the rock align with Earth's magnetic field.
iron particles within the rock align with Earth's magnetic field.
continents move.
continents move.
rocks are heated to extreme temperatures.
rocks are heated to extreme temperatures.
What can scientists learn from magnetic striping patterns? Select the three correct answers.(2 points)
Responses
the cause of magnetic pole reversals
the cause of magnetic pole reversals
the direction plates are moving relative to each other
the direction plates are moving relative to each other
the location of ancient faults caused by seismic activity.
the location of ancient faults caused by seismic activity.
the speed of one plate as it subducts below another plate
the speed of one plate as it subducts below another plate
the exact location of the next earthquake along the California coast
the exact location of the next earthquake along the California coast
the year the next magnetic reversal will take place
the cause of magnetic pole reversals
the direction plates are moving relative to each other
the speed of one plate as it subducts below another plate
Identify the factors that cause magnetic stripes to form along the ocean floor. Select the two correct answers.(1 point)
Responses
Rock forming at the oceanic ridge pushes older rock outward in both directions.
Rock forming at the oceanic ridge pushes older rock outward in both directions.
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
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.
Magnetic direction of rock changes as Earth’s magnetic poles drift.
Magma acquires the magnetic direction present on Earth when it hardens into rock
Plates move as new rock forms, which causes magnetic direction to skew away from normal.
The correct response is "iron particles within the rock align with Earth's magnetic field."
When rocks cool down and solidify, the iron particles within them can align themselves with Earth's magnetic field. This alignment creates a weak magnetic field within the rock, causing it to become magnetic. This phenomenon is known as "remanent magnetization." Rocks that have undergone this process are called "magnetized rocks" or "magnetic rocks."
To determine if rocks have become magnetic, geologists can use techniques like paleomagnetism. This involves measuring the magnetic properties of the rock, such as its polarity and intensity. By analyzing these properties, scientists can learn about the Earth's magnetic field in the past and study the movement of continents.