beam

business

crisis

diesel

digging

donkey

drilling

electric

energy

engineer

equipment

expensive

exploration

extract

extracting

extraction

field

fossil

fuel

gas

gasoline

generation

grasshopper

head

horse

industrial

industry

jack

mechanical

motor

natural

nodding

oil

petroleum

pipe

pipeline

pollution

power

pump

resource

rich

silhouette

sunset

supply

transport

unit

well

worker