Bible Answer

How is the Earth destroyed?

In your Revelation class, you taught that Earth would be destroyed by fire at the judgment. Where does the Bible tell us that the world is destroyed by fire?
 

In Revelation 21, John describes the moment when the Earth and Heavens are destroyed to make way for a new order and a new Heavens and Earth, but Revelation doesn't tell us the manner of that destruction.  We look elsewhere in the Bible to find Peter describe these last days.

2Pet. 3:7 But by His word the present heavens and earth are being reserved for fire, kept for the day of judgment and destruction of ungodly men.