Given a scientific question, generate a correct answer to it.
--------
Question: What has a bigger impact on water quality, natural events or human activity?

Answer: human activity

Question: Each type of electromagnetic radiation has a characteristic range of wavelengths. the longer the wavelength (or the more stretched out it appears), the less energy is carried. short, tight waves carry what?

Answer: most energy

Question: What type of energy is required in all chemical reactions?

Answer:
activation