27. What term describes a smoothly varying signal produced by continuously changing the voltage or current in a circuit? O cathode signal
O analog signal
O diode signal
digital signal

“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

Dis the