אֶ֗רֶץ מִמֶּ֥נָּה יֵֽצֵא־לָ֑חֶם וְ֝תַחְתֶּ֗יהָ נֶהְפַּ֥ךְ כְּמוֹ־אֵֽשׁ׃
As for the earth, out of it cometh bread, And underneath it is turned up as it were by fire.
Read kabbalistic (mystical) interpretation of Job 28:5: and classical mystical sources.