question:
Which is the thickest layer of Earth?

answer:
mantle

question:
During which chemical process is energy absorbed?

answer:
plants photosynthesizing

question:
Visible light passes through glass. Other types of electromagnetic radiation are able to pass through other materials in a similar way. Which of the following are used in medical technology because they can pass through some parts of the human body?

answer:
x-rays

question:
Which of the following describes a reason why companies irradiate some fruits and vegetables before they are sold to the public?

answer:

to extend the shelf life by killing existing microorganisms