What natural system purifies water? 1. sewage treatment plant
2. the water cycle
3. particles precipitate out in oceans and lakes
4. carbon filtration

Blank allows you to do calculations for situations in which only the amount of gas is constant a)boyle's law b)combined gas law c)ideal gas law d)dalton's law

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo