Changes in Earth’s Magnetic Field seem to be a main cause of Volcanic-Eruptions on Earth ! These changes (or disturbances) in Earth’s Magnetic-Field can be caused either by internal processes which take place near the Core-Mantle-Boundary (CMB), or they can be caused by external events which are strong geomagnetic-storms caused by solar wind (space-weather). The maximum impact on volcanism, of the geomagnetic-changes caused by internal processes is around +/-30%, and the maximum impact of the external events is around +/-20%. There is a clear correlation of geo-magnetism, HGFA-seismicity, volcanism and global warming. First the geomagnetic-changes seem to cause earthquakes, especially in High-Geothermal-Flux-(HGF)-areas (e.g. mid-ocean-ridges), then with a delay of 1-2 years Volcanism (& hydrothermal-activity) is increasing, which then rises the Ocean-Heat-Content (->El-Nino-events), and eventually accelerates Global-Warming. We can see a sharp rise and an elevation of the global-volcanic-activity since around 1997, just after the sharp acceleration of the North-Magnetic Pole-shift (Pole-wander) began, around 1-2 years before. The velocity of the North-Magnetic-Pole-shift was <20km/yr before 1990, and it increased to >45km/yr in 1997 ! In just 7 years it more then doubled ! This fast North-Magnetic-Pole-shift is caused by an interference/interaction between two large lobes (blobs) of negative-magnetic-flux near the Earth’s core-mantle-boundary (CMB), as Satellite-data of ESA’s Swarm-mission showed. This fast North-Magnetic Pole-shift, which can be explained by shifts of either fluids or electric-charge near the CMB, is a onetime-event which has increased global-volcanism by around 30% between ~1997 & 2015, probably caused by increased pressure inside Earth’s mantle, as a result of increased dynamical-processes near the CMB. Another effect which must be mentioned here: Strong magnetic-acceleration-patterns (magnetic-waves) which are located along the equatorial regions of the CMB, and which move around Earth’s outer-core with a 7-year period seem to influence Volcanism too. The -number of active volcanos- in the Phillipines which oscillates with a ~7-year period between 0 and ~3 may be the proof for that. Further there is a clear correlation of sunspot-(solar-cycle)-minimas and Lows in the chart of the -Active Volcanos per year- which shows that Earth’s Volcanism is clearly influenced by strong geomagnetic-storm-periods, or by the missing of such storm-periods ! During sunspot-minimas global volcanism clearly decreases by around 20%! Further the chart of -Total Volcanic Eruptions per year- and strong geomagnetic-storms from 1800-2023 shows that there are sharp increases in volcanic-eruptions visible, shortly after strong geomagnetic-storm-periods !