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Conversion of energy describes that energy cannot be created or destroyed, when work is done, energy is changed from one form to another.

Though due to the process through which energy transfers take place not being 100% efficient, energy is sometimes lost to the surrounding and energy gets more spread out, air resistance and friction.

Some types of energy:

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.