GLOSSARY
- anomaly
- (1) A departure from the expected or normal. (2) A geological feature, especially in the subsurface, distinguished by geological, geophysical, or geochemical means, which is different from the general surroundings and is often of potential economic value; e.g. a magnetic anomaly.
- Curie Point or Temperature
- Temperature above which a mineral cannot be permanently magnetized
- declination
- Horizontal angle between geographic north and magnetic north
- lodestone
- A piece of magnetite possessing polarity like a magnet or magnetic needle and hence one that, when freely suspended, will attract iron objects. Also spelled: loadstone
- loving stone
- In China the most usual name for the magnet (tzhu shih),
- as compared to the French word for magnet, aimant
- magnetite
-
A black, isometric, strongly magnetic, opaque mineral of the spinel group, (Fe,Mg)Fe
O
. it often contains titanium oxide, and it constitutes an important ore of iron. Magnetite is a very common and widely distributed accessory mineral in rocks of all kinds. It also occurs as a heavy mineral in sands.
- mantle
- Solid shell of the Earth extending from the crust to the core; divided into the upper mantle (from the Moho down to 670 km depth) and the lower mantle (from 670 km to 2891 km depth of the core-mantle boundary)
- nanoTesla (nT)
- (1) Unit of the magnetic field. (2) 1 nanoTesla (nT) is equal to 10
teslas; 1 tesla is equal to 1 kg A 
.
- Navier-Stokes equation
-
(
/t + v 
)v + 2(
× v) = -P + 
v + 1/3 (v) - 
+ J × B
-
material density, v velocity, angular velocity of rotation, P
pressure, viscocity, gravitation potential, J electric current density, B magneitc induction.
- normal polarity
- (1) A natural remanent magnetization closely parallel to the present ambient geomangetic field direction. (2) A configuration of the Earth's magnetic field with the magnetic negative pole located near the geographic north pole.
- reversed polarity
- (1) A natural remanent magnetization oppostie to the present ambient geomagnetic field direction. (2) A configuration of the Earth's magnetic field with the magnetic positive pole where field lines leave the Earth , located near the geographic north pole.