Energy Sources

noun a combustible black or dark brown rock consisting chiefly of carbonized plant matter, found mainly in underground deposits and widely used as fuel

• Coal is a fossil fuel that is commonly used for electricity generation.
• My grandfather used to work in the coal mines when he was younger.
• I'm so tired, I feel like I've been coal mining all day.
• His heart was as black as coal after what he did.

noun a liquid fuel made from petroleum or other sources, used for heating and powering engines

• The ship's engines were powered by fuel oil to ensure a smooth voyage.
• My dad always makes sure to refill the fuel oil tank before winter hits.
• I heard you can get some cheap fuel oil from that new supplier in town.
• Her determination was like fuel oil, propelling her towards her goals with unstoppable force.

noun a flammable gas, consisting largely of methane and other hydrocarbons, occurring naturally underground and used as fuel

• The country relies heavily on natural gas as a source of energy.
• We use natural gas to heat our home during the winter.
• I love cooking with natural gas because it's so efficient.
• Her laughter was like a burst of natural gas, filling the room with warmth and light.

noun a type of power generation that uses nuclear reactions to produce electricity

• The government is investing in nuclear power as a sustainable energy source.
• Some people believe that nuclear power is the future of clean energy.
• Nuclear power is the bomb when it comes to generating electricity.
• The company's new marketing strategy is like nuclear power - powerful and efficient.

noun a colorless gas used as a fuel

adjective related to or characteristic of propane

• Propane is commonly used as a fuel for heating and cooking.
• We need to refill the propane tank before we can have a barbecue.
• Let's hook up the propane tank and fire up the grill!
• His anger was like a tank of propane, ready to explode at any moment.

noun A word that represents a person, place, thing, or idea. Example: The used-up car was in need of repairs.

verb A word that expresses an action or a state of being. Example: She used up all of her energy during the race.

adjective A word that describes or modifies a noun. Example: The used-up batteries needed to be replaced.

adverb A word that modifies a verb, adjective, or another adverb. Example: She quickly used up all of her savings.

• The supplies were completely used up during the expedition.
• We've used up all the snacks, so we'll need to buy more.
• I used up all my data streaming videos on my phone.
• She felt like she had used up all her energy dealing with difficult customers all day.