Sforno on Genesis 1:10/ספורנו על בראשית א׳:י׳

1ויקרא אלוקים ליבשה ארץ, G’d assigned a name which is applicable to the whole also to parts of it. The reason is that the particular part of the “earth” described previously as merely יבשה, is in reality the most important and productive part of the “earth.” (based on Moreh Nevuchim) Isaiah 45,18 already referred to this when he said of earth that לשבת יצרה, “G’d formed it in order that it be populated,” i.e. subterranean earth is of secondary importance, seeing one cannot cultivate it and make it one’s habitat.