What is the purpose of cooking using sunlight?

Well first of all, you use the sun's heat, not its visible light. The purpose is to save some money, and to avoid releasing toxic combustion byproducts into the air.

“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