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Ice Sheet	large thick plate of glacial ice moving outward in all direction
Iceberg	mass of glacial ice floating in the ocean
Igneous Rock	rock solidified from a high-temperature molten state; rock formed by cooling of magma
Infiltration	absorption and downward movement of precipitation into the soil and regolith
Island Arcs	curved lines of volcanic islands associated with active subduction zone along the boundaries of lithospheric plates
Isobars	line on a map passing through all points having the same atmospheric pressure
Isohyet	line on a map drawn through all points having the same numerical value of precipitation
Isotherm	line on a map drawn through all points having the same air temperature
Isthmus	a relatively narrow strip of land (with water on both sides) connecting two larger land areas
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