No one is saying an asteroid belt. Do you know what the elements are from science class?
2Peter3:
10 But the day of the Lord will come as a thief in the night;
in the which the heavens shall pass away with a great noise, and
the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
11 Seeing then
that all these things shall be dissolved, what manner
of persons ought ye to be in
all holy conversation and godliness,
12 Looking for and hasting unto the coming of the day of God, wherein
the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat?
13 Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness.