Ключевые слова: air, black, business, derrick, diesel, drill, drilling, earth, ecology, ecosystem, emission, energy, environmental, exploration, extraction, factory, fossil, fuel, gas, gasoline, global, globe, icon, illustration, industrial, industry, isolated, line, mining, oil, outline, petroleum, platform, pollution, production, pump, refinery, resource, rig, save, sea, stroke, symbol, tanker, thermostat, thin, tower, transportation, world,