List of Words for Letter ‘I’

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igneous rock A rock that forms when melted rock cools and hardens.
imprint A fossil made by a print or an impression.
inclined plane A flat, slanted surface that is used as a simple machine.
inertia The tendency of an object to remain in motion or to stay at rest unless acted upon by an outside force.
inherited behavior A set of actions that a living thing is born with and does not need to learn.
inner core A sphere of solid material at the center of Earth.
instinct An inherited behavior that is automatic.
insulator A material that slows or stops the flow of energy, such as heat, electricity, and sound.
invertebrate An animal without a backbone.
irrigation The bringing of water to soil through pipes or ditches.