Use the drop-down menus to select the part of Earth best described by each phrase. May help create Earth's magnetic field Can be thick or thin, depending on location Made of molten metal The location of Earth's plates

“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