Question

-1. Alternating parallel bands of normal

Answer 1

Mid Atlantic ridge

Explanation:

Alternating parallel bands of normal and reversed magnetic polarity are found in the basaltic bedrock on either side of the mid Atlantic ridge. The mid Atlantic is a divergent margin where two plate pulls apart from each other.

• At the Atlantic ridge, basalt materials from deeper levels of the crust/asthenosphere rises to the surface.
• On either side of the margin the magma cools and solidifies to form new crust.
• Basaltic magma contains some metallic minerals that can easily be magnetized to the nature of their domains.
• These minerals will align in form of band according to the prevailing condition of the magnetic field at the time of their formation.
• This eventually shows magnetic polarity on either side of each plates.

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