Sewage treatment that provides water purification using physical settling of large particles is best defined as Secondary treatment Primary treatment
Both primary and secondary treatment Tertiary treatment​

What energy conversion occurs when a sling shot is used to shoot a rock across the room? (2 points) question 2 options: 1) stored mechanical energy is converted to mechanical energy. 2) stored mechanical energy is converted to radiant energy. 3) gravitational energy is converted to radiant energy. 4) gravitational energy is converted to mechanical energy.