Ключевые слова: alternative, art, atom, barrel, building, canister, color, colorful, design, drop, eco, ecology, energy, environment, exchange, factory, fire, fuel, gas, gasoline, icon, illustration, industrial, industry, isolated, leaf, liquid, molecule, money, motor, object, oil, petrol, petroleum, pop, popart, power, price, pump, recycle, recycling, science, set, station, symbol, white,