As the plates moved apart, excessive eruptions of lava constructed volcanoes and filled rift valleys. Subsequent movement rifted these later lava fields, causing long, linear valleys bounded by parallel faults. The divergence of the ridge started in the north about 150 million years ago and 90 million years ago in the south. These movements continue today, accompanied by earthquakes, reactivation of old volcanoes, and creation of new ones. I hope this helps!!
The crab nebula consists of an oval-shaped mas of the filaments and they are imprints of the progenitor star that surrounds the diffused blue region and is helium-rich, other than gold other elements like the iron, oxygen and the uranium are produced.
