A metal detector can detect all types of metal....depending on in what type of soil it is in.
Nope. Just metal...
Not necessarily. That would depend upon the metal detector design and the sensitivity settings.
no there was no electricity i think
Yes the metal detector would but it is a large object and you would see it also.
No it cannot.
Basically No. But the detector have a camera then yes.
Depends on the size of the metal detectors, and the size of the metal under the surface of the earth. The bigger the metal detector, the bigger the piece of metal, the deeper down it will detect.
Sure if there is enough metal like steel rebar
Only if the mercury is in large concentrated amounts.
Yes, you can use a metal detector in the rain if....... The detector is made for underwater use. If the metal detector is made for land use, put a cover over the electronics housing. Many of the top manufacturers sell rain-proof covers. Be sure your headphones are waterproof!
Metal detectors are designed to detect all metals. However, many modern detectors have the ability to discriminate out metals of your choosing. You are basically setting the detector to remain silent when passing over the metals you don't want.