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A LITTLE SOMETHING WORTH KNOWING

A small discovery. Yours to pass on.

ScienceOne small ahaEarth or weather concept

Air expanding rapidly after a lightning strike produces this sound.

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ScienceOne small aha
Your new ahaThunder

Thunder: Produced by the rapid expansion of air heated by lightning. Source: Thunder ↗

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More from Earth & Weather

A few more worth knowing.

  1. 24Generated by motions in the outer core, this planetary field deflects many charged solar particles.RECALL
    Earth's Magnetic Field

    Earth's magnetic field, generated by molten iron in the outer core, shields the planet from much of the Sun's radiation.

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  2. 25Each whole-number increase on this original earthquake-magnitude scale represents a tenfold increase in measured wave amplitude.RECALL
    Richter Scale

    The Richter scale expresses earthquake magnitude, with each whole number marking a tenfold jump in measured amplitude.

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  3. 26Layers of deposited material form this rock type, which often preserves fossils.RECALL
    Sedimentary Rock

    Sedimentary rock forms from compacted layers of sediment and often preserves fossils of ancient life.

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