Which of the following atmospheric components is beneficial to humans at higher altitudes, but dangerous near ground level? A. carbon dioxide
B. sulfuric acid
C. oxygen
D. ozone

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation