Genesis 7:24 - Cleansing the earth.

And the waters prevailed upon the earth an hundred and fifty days.

God created the earth and manipulates its elements at will, including the water (Genesis 1:1, 1:6-7, Exodus 14:21, Psalm 24:1). God allowed the water level to rise above the highest montain to cleanse the earth from its wickedness (Genesis 6:1-7). God then gradually returned the waters from whence it came from; at the end of the hundred and fifty days, the water level was back to normal (Genesis 8:3).