Vocabulary

• answer to: To be responsible to someone and have to explain your actions to them.
• for that matter: Used to emphasize that something is true or likely to happen, or to introduce a related point.
• in fact: Used to emphasize the truth of a statement, especially one that contrasts with or contradicts something else.
• energy sources: Materials or processes that can produce energy.
• on demand: Whenever requested or needed.
• have to: Must do
• as well as: Also; in addition to
• term: Conditions applying to an agreement, contract
• need: To be unable to manage without something; require
• fuel: To give power to (a mob, anger, etc.); incite
• produce: Fresh foods such as fruits and vegetables
• mass: Religious ceremony in some Christian churches
• problem: Something difficult to deal with or causes trouble
• energy: Physical or mental strength
• wind: A current of air moving approximately horizontally, especially one strong enough to be felt
• lot: What happens to a person in life from chance; fate
• store: To put things in a place for later use
• free: Living, happening without being controlled
• power: Legal or official right to perform certain actions
• expensive: Costing a lot of money
• fossil: Plant or animal that became rock after many years
• industrial: Concerning making things in factories