List of Words for Letter ‘I’

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igneous rock A rock formed when magma or lava cools and hardens. A “picture” of the light source that light rays make in bouncing off a polished, shiny surface.
image A "picture" of the light source that light rays make in bouncing off a polished, shiny surface.
incomplete metamorphosis A series of three growth stages that occur gradually.
inertia The tendency of a moving object to keep moving in a straight line or of any object to resist a change in motion.
inherited trait TA characteristic that is passed from parent to offspring.
inner core A solid layer of iron and nickel inside Earth.
insolation The amount of the Sun’s energy that reaches Earth.
instinct An inherited behavior, one that is not learned but is done automatically.
internal fertilization The joining of sperm and egg cells inside a female’s body.
intertidal zone The shallowest part of the ocean ecosystem, where the ocean floor is covered and uncovered as the tide goes in and out.
invertebrate An animal that does not have a backbone.
ion An electrically charged atom or molecule with unequal numbers of protons and electrons.
island arc A string of volcanic islands made from melted rock rising up from beneath the sea floor.
island chain A formation of islands aligned above a volcanic hot spot.