Genesis 2:4 These are the generations of the heavens and of the earth when they were created, in the day that the LORD God made the earth and the heavens,
Yom from an unused root meaning to be hot; a day (as the warm hours), whether literal (from sunrise to sunset, or from one sunset to the next), or figurative (a space of time defined by an associated term), (often used adverb):--age, + always, + chronicals, continually(-ance), daily, ((birth-), each, to) day, (now a, two) days (agone), + elder, X end, + evening, + (for) ever(-lasting, -more), X full, life, as (so) long as (... live), (even) now, + old, + outlived, + perpetually, presently, + remaineth, X required, season, X since, space, then, (process of) time, + as at other times, + in trouble, weather, (as) when, (a, the, within a) while (that), X whole (+ age), (full) year(-ly), + younger.
3: The Book of Genesis is not a science text, it is not about HOW God created but WHY God created. It is allegory and myth rolled into one package.