"of the sweet things of the heaven, of the dew" — whereby we are taught that dew was ever present there. "and of the deep, lying below" — whereby we are taught that it was watered by springs.
(Ibid. 14) "And of the sweet things brought forth by the sun" — whereby we are taught that it was "open" to the sun. And it was, similarly "open" to the moon, viz. (Ibid. 14) "and of the sweet things (like melons) quickened by the moon."
(Ibid. 15) "And of the first (ripened fruits) of the mountains of "yore," and of the sweet things of the eternal (i.e., eternally fruitful) hills — whereby we are taught that the (fruits of) the mountains of Joseph are the first (to ripen) of those of Eretz Yisrael; and those of Eretz Yisrael are the first of the mountains of all the lands.