Scientists believe, on good evidence, that part of the earth’s core is fluid. This is the first of a series of articles proposing that the fluid is not molten iron as generally thought, but water under great heat and Pressure. Here the author examines many scripture passages about the earth’s interior and concludes that the Bible strongly suggests such a hypothesis. In later articles, the author intends to show that the hypothesis is consistent with the known experimental data about the earth and water under high pressures, and that it has important scientific implications, concerning (for example) the separation of the continents, the earth’s magnetic field, and craters in the solar system.