Describe how water may be treated before it is used by people?

P. S - This is a science question.

The volume (in L) that would be occupied by 5.00 mol of O2 at STP is A. 0.411 L. B. 22.4 L. C. 41.6 L. D. 112 L.

If frequency is kept constant, how are the velocity and wavelength of a wave related?

Which of the following lists the Earth's layers in order from hottest to coldest in temperature? A. outer core, mantle, inner core, crust B. crust, mantle, outer core, inner core C. inner core, outer core, mantle, crust D.

Taking the direction west to be positive, and east to be negative, what is the average acceleration of a jet ski that goes from rest to 10 m/s west in 4 seconds? A. 2.5 m/s2 B. 0.4 m/s2 C. - 0.4 m/s2 D. - 2.5 m/s2

Apply Newton's first law to music playing on the radio.

4. Why isn't full employment the same as zero unemploy- ment?

A claw hammer is used to pull a nail from a piece of wood. Where should you place your hand on the handle and where should the nail be located in the claw to make the effort force as small as possible?

Two tuning forks, 254 Hz. and 260. Hz, are stuck simultaneously. how many beats will be heard?

What is a positive impact of artificial fertilizers

The coloring of the blue morpho butterfly is protective. As the butterfly flaps its wings, the angle at which light strikes the wings changes. This causes the butterfly's color to change and makes it difficult for a predator to follow.