R. Eliezer says: "and about two cubits above the earth": the quail were two cubits above the ground, and Israel took them from the top (layer). Come and see how the manna descended for Israel: A north wind would come and "sweep" the desert. Then rain would come and clean the ground, and the dew would rise and the wind would blow on it and make it like golden tables, on which the manna descended. And Israel would eat it, saying:
Before a Single Flake of Manna Appeared, God Orchestrated an Elaborate
Mekhilta Tractate Vayassa 4:10