thermostat, a device that automatically regulates temperature, speedometer, an instrument on a vehicle's dashboard indicating its speed., geography, the study of the physical features of the earth and its atmosphere, telescope, an optical instrument designed to make distant objects appear nearer, geology, the science that deals with the earth's physical structure and substance, its history, and the processes that act on it., barometer, an instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude., thermal, relating to heat., periscope, an apparatus consisting of a tube attached to a set of mirrors or prisms, by which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight., zoology, the scientific study of the behaviour, structure, physiology, classification, and distribution of animals., diamater, a straight line passing from side to side through the centre of a body or figure, especially a circle or sphere., etymology, the study of the origin of words and the way in which their meanings have changed throughout history., geothermal, relating to or produced by the internal heat of the earth., biology, the study of life, perimeter, the continuous line forming the boundary of a closed geometrical figure., autobiography, an account of a person's life written by that person., scope, scop, to see, logy, -logy, study, science, theory, bio, life, geo, Earth, meter, metr, measure.

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