"Thou visitest the earth, and waterest it: thou greatly enrichest it with the river of God, which is full of water: thou preparest them corn, when thou hast so provided for it" (Psalm 65:9).
The inexhaustible river of God, watering the whole Earth, is nothing less than the refreshing rains coming down from the heavens, "visit|ing|" the earth on its amazing journey to the oceans, whence it flows back up to the skies again. This river incorporates all the rivers of Earth, yet it is like no other river, for once it reaches the ocean, it rises into the heavens, there to flow back over the thirsty ground and finally descend once more on its endless journey.
What a wonderful provision is this river of God! Without it, all life on Earth would soon die. Far more valuable than gold, it continually "enrich|es|" the earth on its regular visitations "To satisfy the desolate and waste ground; and to cause the bud of the tender herb to spring forth" (Job 38:27).
Thereby does God also prepare corn to feed man and beast. The word "corn" in this and other passages probably refers generically to any of the cereal grains which provide the basic foodstuffs for people and animals all over the world. This is implied in the creation passage itself. "And God said, Behold, I have given you every herb bearing seed, which is upon the face of all the earth. . . . And to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is life, I have given every green herb for meat" (Genesis 1:29-30).
This is God's wonderful life-giving river. "He watereth the hills from His chambers: the earth is satisfied with the fruit of thy works. He causeth the grass to grow for the cattle, and herb for the service of man: that he may bring forth food out of the earth" (Psalm 104:13-14). The Creator is also the Sustainer (Colossians 1:16-17). HMM