The 1270x950 km Permian-Triassic (PT)-Impact Crater on the ocean-floor of the Arctic-Sea will confirm the hypothesis that Global Impact Events are the cause for plate tectonics, or more precise the cause for a combination of plate-tectonics and expansion-tectonics ! The PT-Impact Crater in all probability was caused by a big comet or asteroid with a diameter of 60 to 200km, which probably collided with our planet at a very shallow angle of less than 8° near the North-Pole, with an estimated low impact velocity of ≈8km/s. A global fracture pattern on Earth’s crust was caused by this powerful impact and the ejecta of the impact, which mainly impacted in the form of powerful ejecta-rays and caused secondary-crater-chains with craters in the range of Ø100-300km on different continents ! The most Impressive are the Ejecta-Rays 1 to 4 in Africa. The sudden decompression of Earth’s mantle, caused by the PT-Impact, triggered an expansion process in the mantle, which was caused by volatiles like H2O, CO2 and SO2 in the mantle-material. The large amounts of ejecta-material, that were caused by the PTI, descended partly in Earth’s mantle and caused the African- and Pacific-LLSVP (& ULVZ) and in this way the volcanism on Earth for the last ≈250Ma ! The PTI also started a plate tectonics process on the expanding Earth-mantle, which is still going on today. In the same way an Expansion-Tectonics- and Plate-Tectonics-process was triggered on Earth, such a process was triggered by other giant impacts on other planets and moons of our Solar System ! There is evidence for other powerful Global Impact Events which occurred on the planets Venus, Mars and Pluto, and on Jupiter’s moon Ganymede, on Saturn’s moons Enceladus & Iapetus, and on Pluto’s moon Charon, and on our Moon ! These global impact events, which occurred on other planets and moons, probably all took place within the last 300 million years ! The root cause of these global impact events, caused by large Impactors in the diameter range of 20-200 km, are probably large amounts of debris located mainly in (or close to) the galactic plane of our galaxy. Tidal debris streams, caused by galaxy-collisions seem to be the source of these debris (asteroids & comets). This dark (low-albedo) debris-material in the galactic plane may represent the long searched-for invisible “Dark Matter” !