What on Earth is AlphaEarth? Hierarchical structure and functional interpretability for global land cover. - Iván Felipe Benavides-Martínez; Justin Guthrie; Jhon Edwin Arias; Yeison Alberto Garcés-Gómez; Ángela Inés Guzmán-Alvis; Cristiam Victoriano Portilla-Cabrera; Somnath Mondal; Andrew Allyn; Auroop R. Ganguly (CoRR, 2026)