The problem with quoting the Bible is that it's often easy to find a contradiction in this case Revelation 21 Then I saw “a new heaven and a new earth, for the first heaven and the first earth had passed away, and there was no longer any sea."
In Scripture I find heaven can refer to what is above us such as the mid-heavens where the birds fly, and also governmental heavens ruling over mankind. Sometimes governing is also likened to being mountain like over us.
The ' NEW heavens and NEW earth ' mentioned in Revelation is in connection to Isaiah 65:17-25 describing the good peaceful conditions coming to earth under Christ's coming rulership.
The NEW heavens and the NEW earth of 2 Peter 3:13.
Please notice there are three (3) heavens and three (3) earth's mentioned in verses 5, 7, 13
* The heavens and earth of OLD ( heaven and earth of Noah's day )
* The heavens and earth of NOW ( since Noah's day to our Now day ) This way of ruling will be gone. - Rev. 20:11
* The heavens and earth of NEW ( a cleansed new society. Humble meek inheriting earth under a righteous heavens, or meaning Jesus' coming millenium-long day of governing over Earth in righteousness)
This is in connection to Isaiah' swords at Isaiah 66:22 showing the NEW will remain. (Proverbs 2:21-22)
2 Peter 3:10 is about the NOW governmental heavens, or the governments NOW over mankind. Not about God's heavenly home. As far as the symbolic sea of Revelation 21:1 being No more, that is also in connection to Isaiah's words at Isaiah 57:20. The restless wicked ' sea of mankind ' will be No more. Or as Psalms 92:7 says the wicked destroyed forever. Please also notice how ' water ' is used to symbolize or stand for ' people ' at Revelation 17:1 B; Revelation 17:15.