Marine current power the rotation of the earth. The sun acts as the primary driving force, causing winds and temperature differences. Because there are only small fluctuations in current speed and stream location with minimal changes in direction, ocean currents may be suitable locations for deploying energy extraction devices such as turbines. Other effects such as regional differences in temperature and salinity and the Coriolis effect due to the rotation of the earth are also major influences. The kinetic energy of marine currents can be converted in much the same way that a wind turbine extracts energy from the wind, using various types
Plane of rotation is reflected in another, distinct, -dimensional space, described by a unit vector perpendicular to it, the result is This is a simple rotation in dimensions, through twice the angle between the subspaces, which is also the angle between the vectors m and . It can be checked using geometric algebra that this is a rotation, and that it rotates all vectors as expected. The quantity is a rotor, and is its inverse as So the rotation can be written where is the rotor. The plane of rotation is the plane containing and , which must be distinct otherwise the reflections