About six thousand years ago God created the heaven and the earth. God did this because He needed a change in His life, for He was becoming bored. He had known only a life of doing nothing but floating around in the void and darkness and waters. So, creating the heaven and the earth would be exciting. To prolong the excitement, God stretched things out, and so did His creating not all at once, but in stages.
He began by saying “Let there be light”. And there was light, that He called Day. He also created darkness, that He called Night.
Next, God created dry land, and called it Earth. Then He created waters, that he called Seas.
God ordered the Earth to bring forth grass, herb yielding seeds, and fruit trees. The Earth did as ordered. After this, God created the moon and stars in order to ameliorate the remorseless blackness of the night sky.
God then ordered the waters to bring forth moving creatures that had life, like whales and fish, and also fowls that might fly above the earth. God then told the Earth to bring forth beasts, cattle, and the various creepy-crawly forms of life. However, not content with just beasts, cattle, and the creepy-crawly things, God created Man (us), but not without telling Man to be fruitful and multiply, and to replenish the Earth and subdue it, and to have dominion over fish and fowls, and indeed over everything which moved upon the Earth, even the creepy-crawly things.
This all took a mere six days. It represented an incredible rate of productivity, which even we today with our sophisticated computer technology and enlightened management techniques, would have difficulty emulating. So exhausted was God after all this, that He took the next (seventh) day off and did nothing, except bless and sanctify His day off.
Source: Genesis 1