Question: If oxygen is required to burn a building, then what is required to burn a building? Answer choices: - oxygen - voltage - sigh - ghost - words - sunlight - heat - power
Answer: oxygen

Question: If water erodes rocks as they flow over, creating a valley, then what is created when rocks erode? Answer choices: - calcite - A pond - A valley - detritus - fossil fuels - A river - A volcano - a prism
Answer: A valley

Question: If alaser is used for producing energy, then what is produced by a laser? Answer choices: - work - Collagen - emissions - a wave - sound - noise - energy - unique
Answer:
energy