The Quaternary undersea valley Fosse Dangaered, and Castle Hill landslip at the English portal, caused concerns. Identified by the 1964â65 geophysical survey, the Fosse Dangaered is an infilled valley system extending 80 metres (262 ft) below the seabed, 500 metres (1,640 ft) south of the tunnel route in mid-channel.
Best Answer: Magnetic forces can be caused by an electric current. Or they can be caused by magnetic domains aligned correctly. These domains are magnetic moments created by moving atoms in the material who have an electric dipole (usually).
The magnets with the most powerful fields are possibly the heavy lift magnets used in scrap yards. An all cases, the magnetic field is created by the movement of electrons. Either the electrons spinning as is the case in permanent magnets; or as electrons carried along a wire as electric current.