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).
Magnetism (Chapter 24) MAGNETIC Poles, Forces and Fields . DEMO magnet and paper clips (Comment on the weakness of the gravitational field) Similar to the arguments I gave back when we introduced the causes of all electrical phenomena, I will repeat this for the magnetic phenomena. 1. What is the cause of all magnetic phenomena? A moving electric charge. However, magnetism was first believed to be cause by magnetic poles. There are two types of magnetic poles: North and South magnetic poles. 2. Since there are two types of magnetic poles, there are two types of magnetic forces: attractive or repulsive