Answer:
As San Francisco and other cities in the Bay Area commemorate the anniversary of the 1989 Loma Prieta earthquake, we are reminded once again of the need to get prepared for the next natural disaster. The 6.9 magnitude earthquake not only resulted in collapsed homes, displacement of residents, but it also was a terrifying reminder of the need to reinforce the structures we use every single day.
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Explanation:
♤decay of radioactive elements
♤ leftover heat from planetary formation
♤heat released as the liquid outer core solidifies near its boundary with the inner core.
