QuestionJune 12, 2025

How does geomagnetism provide support for seafloor spreading? Mantle hot spots are always oriented to the magnetic field. The ocean floor is uniformly old, preserving the Earth's 4.6 billion history including past reversals in polarity. Isotopic analysis of ocean core sediments help determine sea floor age and this can be used to infer past magnetism. The oldest oceanic crust is always found near mid-ocean ridges. As one moves out from these ridges, the crust is simultaneously younger and oriented according to the polarity at the time. Magnetic particles in basalt orient with the magnetic field in force at the time the oceanic lava cooled and hardened;the magnetic pattern is the same on both sides of the ridge.

How does geomagnetism provide support for seafloor spreading? Mantle hot spots are always oriented to the magnetic field. The ocean floor is uniformly old, preserving the Earth's 4.6 billion history including past reversals in polarity. Isotopic analysis of ocean core sediments help determine sea floor age and this can be used to infer past magnetism. The oldest oceanic crust is always found near mid-ocean ridges. As one moves out from these ridges, the crust is simultaneously younger and oriented according to the polarity at the time. Magnetic particles in basalt orient with the magnetic field in force at the time the oceanic lava cooled and hardened;the magnetic pattern is the same on both sides of the ridge.
How does geomagnetism provide support for seafloor spreading? Mantle hot spots are always oriented to the magnetic field. The ocean floor is uniformly old, preserving the Earth's 4.6 billion history including past reversals in polarity. Isotopic analysis of ocean core sediments help determine sea floor age and this can be used to infer past magnetism. The oldest oceanic crust is always found near mid-ocean ridges. As one moves out from these ridges, the crust is simultaneously younger and oriented according to the polarity at the time. Magnetic particles in basalt orient with the magnetic field in force at the time the oceanic lava cooled and hardened;the magnetic pattern is the same on both sides of the ridge.

Solution
4.4(296 votes)

Answer

Geomagnetism supports seafloor spreading by showing symmetrical magnetic patterns on either side of mid-ocean ridges, indicating new crust formation and outward movement. Explanation 1. Identify the Key Concept Geomagnetism supports seafloor spreading through magnetic patterns in oceanic crust. 2. Explain Magnetic Orientation Magnetic particles in basalt align with Earth's magnetic field when lava cools, recording the polarity at that time. 3. Describe Symmetrical Patterns These magnetic patterns are symmetrical on both sides of mid-ocean ridges, indicating new crust forms and spreads outward. 4. Relate to Seafloor Age Isotopic analysis shows age differences; older crust is farther from ridges, supporting continuous formation and spreading.

Explanation

1. Identify the Key Concept<br /> Geomagnetism supports seafloor spreading through magnetic patterns in oceanic crust.<br /><br />2. Explain Magnetic Orientation<br /> Magnetic particles in basalt align with Earth's magnetic field when lava cools, recording the polarity at that time.<br /><br />3. Describe Symmetrical Patterns<br /> These magnetic patterns are symmetrical on both sides of mid-ocean ridges, indicating new crust forms and spreads outward.<br /><br />4. Relate to Seafloor Age<br /> Isotopic analysis shows age differences; older crust is farther from ridges, supporting continuous formation and spreading.
Click to rate:

Similar Questions