The terms "evening" (Hebrew ereb) and "morning" (Hebrew boger) each occur more than one hundred times in the Old Testament and always have the literal meaning – that is, the termination of the daily period of light and the daily period of darkness, respectively. Similarly, the occurrence of "day" modified by a numeral (e.g., "third day") is a construction occurring more than one hundred times in the Pentateuch alone, always with a literal meaning. Even though it may challenge our minds to visualize the lands and the seas, and all plants, being formed in one literal day, that is exactly what the Bible says! We are not justified at all in questioning either God's power to do this or His veracity in telling us that He did.
Henry Morris