Patent Number: 
Section: claims

1. A system comprising:an injection boring; anda gravity fracture located below an exit point of the injection boring and filled with a fluid being denser than a rock formation into which the fluid is to be disposed so as to cause the rock formation to gravity fracture, the fluid propagating downward in the gravity fracture as the gravity fracture propagates downward. 2. A system according to claim 1 wherein the fluid has a density of at least 3.0 g/cm3. 3. A system according to claim 1 wherein the fluid is a slurry. 4. A system according to claim 3 further comprising the slurry including a solid material which is blended with at least one waste. 5. A system according to claim 4 wherein the solid material is a metal. 6. A system according to claim 5 wherein the metal is selected from the group consisting of bismuth, iron, lead, and copper. 7. A system according to claim 5 wherein the solid material contains one or more radionuclides. 8. A system according to claim 3 wherein a liquid component of the slurry is a metal having a melting temperature less than a temperature at a bottom end of an injection boring from which the fluid exits into the rock formation. 9. A system according to claim 8 wherein the metal is selected from the group consisting of mercury, woods metal, indalloy 15, and gallium. 10. A system according to claim 1 further comprising the fluid including a liquid. 11. A system according to claim 10 wherein the liquid includes at least a portion thereof selected from the group consisting of a cross-linked polymer gel and a hydrated clay slurry. 12. A system according to claim 10 wherein the liquid is a metal having a melting temperature less than a temperature at a bottom end of an injection boring from which the fluid exits into the rock formation. 13. A system according to claim 10 wherein the liquid is a metal selected from the group consisting of mercury, woods metal, indalloy 15, and gallium. 14. A system according to claim 1 further comprising the fluid including a solid material. 15. A system according to claim 14 wherein the solid material is a metal. 16. A system according to claim 15 wherein the metal is selected from the group consisting of bismuth, iron, lead, and copper. 17. A system according to claim 14 wherein the solid material contains one or more radionuclides. 18. A system according to claim 1 further comprising the fluid including a waste material to be disposed of. 19. A system according to claim 18 wherein the waste material is a hazardous waste. 20. A system according to claim 19 wherein the waste material is a radioactive waste. 21. A system comprising:an injection boring arranged to receive a fluid containing a waste material, the fluid being denser than a rock formation into which the fluid is to be disposed; anda gravity fracture located below an exit point of the injection boring, the fluid propagating downward in the gravity fracture as the gravity fracture propagates downward. 22. A system according to claim 21 wherein the fluid is a slurry including a solid material blended with the waste material.