There are thousands of rivers in the world, and all of them individually dumps millions of gallons of water per second into the seas. Where all that water goes as there is no increase in the sea level. The answer lies in the hydrologic cycle, which is the continuous circulation of water in the Earth. This concept was not fully understood until the 15th century AD. The water on the Earth, below and above its surface is in constant motion changing states between liquid, vapor, and ice.
Ancient people believed that there is a large underground freshwater lake or several watery hollows that supplied the rivers with water through springs. Aristotle somewhat detailed and defined evaporation and condensation but the idea of subterranean water, being the main source of the supply was predominant. These theories came about mainly because no one could believe that rainfall was sufficient to keep rivers flowing. In the 17th century AD, Pierre Perrault developed the concept of the hydrological cycle. He and Edme Mariotte were initially responsible for making hydrology an experimental science. With a series of experiments, Perrault showed that rain does not penetrate the soil beyond about 2 feet. Thus, most of the rain that falls does not go into springs. Also, he demonstrated that several times more rain fell than there was water in the river.
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Thousands of years ago, the Bible mentioned all these modern concepts of hydrology in detail in various verses and included complete descriptions of the hydrologic cycle.
Ecclesiastes 1:7: All the rivers flow into the sea, yet the sea is not full. To the place where the rivers flow, there they flow again. NASB
This short verse contains full science and the exact process of hydrology and describes the recirculation of water.
Below are the Bible verses related to the circulation of water. No comments added as you can read yourself and see what treasures of knowledge they contain.
Psalm 135:7: He causes the vapors to ascend from the ends of the earth; He makes lightning for the rain; He brings the wind out of His treasuries. NKJV
Job 26:8: He wraps up the waters in His clouds, And the cloud does not burst under them. NASB
Isaiah 55:10: For as the rain comes down, and the snow from heaven, And do not return there, But water the earth, And make it bring forth and bud, That it may give seed to the sower And bread to the eater. NKJV
Jeremiah 10:13: When He utters His voice, There is a multitude of waters in the heavens: “And He causes the vapors to ascend from the ends of the earth. He makes lightning for the rain, He brings the wind out of His treasuries. NKJV
Job 36:27-29: For He draws up drops of water, Which distill as rain from the mist, Which the clouds drop down. And pour abundantly on man. Indeed, can anyone understand the spreading of clouds. The thunder from His canopy?
Amos 9:6: The One who builds His upper chambers in the heavens And has founded His vaulted dome over the earth, He who calls for the waters of the sea And pours them out on the face of the earth, The Lord is His name. NASB
Psalms 104:13: He waters the mountains from His upper chambers; The earth is satisfied with the fruit of His works. NASB
Job 37:16: Do you know how the clouds are balanced, Those wondrous works of Him who is perfect in knowledge? NKJV
Job 37:11: Also with moisture, He saturates the thick clouds; He scatters His bright clouds. NKJV