The land area from which surface runoff drains into a stream channel, lake, reservoir or other body of water; also called a drainage basin.

Figure 10-1 study figure 10-1. the strong nuclear force felt by a single proton in a large nucleus

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?

What’s the scientific notation for the number 6,840,000,000