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Iron-rich rocks can exhibit both normal and reversed magnetic polarity. When these rocks cool and solidify, the minerals containing iron align with the Earth's magnetic field. Over time, the Earth's magnetic field can reverse, causing the mineral alignment to also reverse, resulting in rocks with reversed polarity.
Earth's current polarity is normal. This means that the direction of the magnetic field is aligned with what is considered the usual orientation, with the magnetic north pole roughly aligned with the geographic North Pole.
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These alternating parallel bands of normal and reversed magnetic polarity are found in the basaltic bedrock on either side of mid-ocean ridges, where new oceanic crust is formed through seafloor spreading. This pattern is a result of the Earth's magnetic field periodically reversing over geological timescales, leaving a record of these reversals in the oceanic crust as it solidifies.
Reversed polarity in a 110-volt receptacle usually occurs when the hot and neutral wires are connected to the wrong terminals. This can happen due to incorrect wiring during installation, loose connections, or faulty outlets. It can be hazardous because it can lead to electrical shocks and damage to appliances or devices plugged into the outlet.