If you describe the ground as ~, you mean that it feels safe in contrast to being in the air or at sea.
...his relief on finding himself once more on ~.
N-UNCOUNT
If you describe the ground as ~, you mean that it feels safe in contrast to being in the air or at sea.
...his relief on finding himself once more on ~.
N-UNCOUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012