SciFi and Fantasy Book Club discussion

These are the books that were nominated for the Earth SciFi theme. Please keep recommending any books that fit the theme. Nomination rules no longer apply, all authors/formats welcome!

Venomous Lumpsucker
The Light Pirate
Gods, Monsters, and the Lucky Peach
Notes from the Burning Age
Aurora
Good Morning, Midnight
Veniss Underground
Journey to the Center of the Earth
Ancient Shores
Earth
The Hollow Earth
The Moonday Letters
Mother of Storms
Dead Space
The Forge of God
Wasteland of Flint
Fragment

Please remind us of the theme's particulars.

Of the earth, on the Earth, or for the Earth

I'll add Terms of Enlistment. It takes place on earth, for the earth.

Niels Klim's Underground Travels by Ludvig Holberg is a classic in speculative fiction and was the first fully realized novel set underground in a hollow earth. It might be too short to pass the strict scrutiny of the mods, but being a SciFi novel from 1741, perhaps it can be recommended either way. Holberg is a satirical writer, fun to read:

“A philosopher is a scientific tradesman, who, for a certain price, sells prescriptions of self-denial, temperance and poverty; he generally preaches the pains of wealth, till he becomes rich himself, when he abandons the world for a comfortable and dignified retreat. The father of the philosophers, Seneca, is said to have collected royal wealth.

A poet is one who makes a great stir with printed prattle, falsehood and fury. Madness is the characteristic of the true poet. All those who express themselves, with clearness, precision and simplicity are deemed unworthy of the laurel wreath.

The grammarians are a sort of military body, who disturb the public peace. They are distinguished from all other warriors, by dress and weapons. They wear black instead of colored uniforms, and wield pens rather than swords. They fight with as much obstinacy for letters and words as do the others for liberty and father-land.”
― Ludvig Holberg, The Journey of Niels Klim to the World Underground