How did the germanic tribes lead to the immediate collapse of rome?

Germanic Tribes were clans that belonged outside of the Roman Empire and were the cause of the fall of Rome. The fall of Rome was caused by six particular Germanic tribes, namely the Huns, the Visigoths, the Vandals, the Ostrogoths, the Franks, and the Anglo Saxons. Each of these Germanic Tribes took down a part of the Roman empire until the whole of the Roman Empire collapsed and became occupied by Germanic Tribes from different regions of the Western world.

which of the following is a subsurface event that takes place during the rock cycle?

  cementing  erosion  melting  weathering

D. providing for public safety