6. What is a collision?
a. Two objects coming in contact with each other
b. Two objects repelling each other
c. Two external forces creating movement of an object
d. Two internal forces creating movement of an object
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A. Two objects coming in contact with each other

“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

Idont understand the question