Examlex
What is the origin of petroleum?
Light
The natural agent that stimulates sight and makes things visible, consisting of electromagnetic radiation that is visible to the human eye.
Vibrations
Rapid oscillations of particles about an equilibrium position, which can occur in physical objects, air molecules, or other mediums.
Sounds
Vibrations that travel through the air or another medium and can be heard when they reach a person’s or animal's ear.
Touch
One of the five senses, referring to the ability to perceive pressure, temperature, and texture through physical contact with the skin.
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