What is the recommended daily dosage of flouride for a child over three years of age living in an area where drinking water is free fluoride

Which equations represent the relationship between wavelength and frequency for a sound wave?

1The Drifting Rocks are a strange phenomenon still unexplained by science. 2Located in Death Valley, California, the rocks sit on hot, flat ground. 3Unlike normal rocks, they have trails etched behind them as if they have traveled across the sand.

Two objects are located on an airtrack. The magnitude of the charge on object A is 3 times higher than on object B, and object A also has a 8 times higher mass than object B.

Which of the following occurs in every chemical reaction? A) Water is given off B) The total mass of the reactants increases C) The total mass of reactants equals the total mass of the product D) The total mass of the products is grater than the

From lowest energy to highest energy, which of the following correctly orders the different categories of electromagnetic radiation?

The acceleration of gravity means that for each second that passes, falling objects move 9.8 meters. A. True B. False

Explain, using numbered steps, how you could find the volume of a small, irregularly shaped rock.

Which of the following is not a receptor pair according to the opponent process theory? A. red versus green B. yellow versus blue C. black versus white D. yellow versus red

A scientist adds different amounts of salt to 5 bottles of water. He then measures how long it takes for the water to boil. what is the dependent variable in this experiment?

Bacteria which do not live in extreme conditions are found in this kingdom: