Ultraviolet (uv) radiation is a part of the electromagnetic spectrum that reaches the earth from the sun. it has wavelengths shorter than those of visible light, making it invisible to the naked eye. these wavelengths are classified as uva, uvb, or uvc, with uva the longest of the three at 317 nm to 400 nm. both the u. s. department of health and human services and the world health organization have identified uv as a proven human carcinogen. many experts believe that, especially for fair-skinned people, uv radiation frequently plays a key role in melanoma, the deadliest form of skin cancer, which kills more than 8000 americans each year. uvb has a wavelength between 280 nm and 317 nm. determine the frequency ranges of uva and uvb. uva hz (smaller value) hz (larger value) uvb hz (smaller value) hz (larger value)

“other instruments such as gravimeters and magnetometers are also used in the search for petroleum. extracting crude oil normally starts with drilling wells into an underground reservoir. when an oil well has been tapped, a geologist (known on the rig as the "mudlogger") will note its presence. “ this is what i found on google i hope it

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.