What depth can metal detectors detect down to? 15 cm
What do archaeologist use them for? Position of burial deposits
What is GPR? Ground penetrating radar
How does it work? Transmits pulses of energy in to the ground and records the time taken to return the signal.
What can be detected using GRP? landscapes and rivers which are buried.
What is sonar? It measures sound waves as they bounce back it reveals depth and form of sunken structures.
What is bosing? It involves hitting the ground with a mallet and listening to the variations in the sound.
What is dowsing? It uses wooden rods to detect water and archaeology.
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