Metals such as iron, lead, copper, and zinc have relatively specific heats. this means it takes energy to change their temperatures.

there is none because earth is stationary and flat.

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.