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I is for iceberg, like the one that'll sink ya

-Indian summer – an unseasonably warm spell with clear skies near the middle of autumn. Usually follows a substantial period of cool weather.
 
-Infrared Radiation: electromagnetic radiation with wavelengths between about .7 and 1000 nm

-Innage: Measurement of depth of liquid in a tank taken by sounding. Measurement is from tank bottom to the top of the liquid.

 

-Isotherm – a line connecting points of equal temperature