Across
- 2. Topographic area which has been created by the dissolution of carbonate rock terrain. It is characterized by caverns, sinkholes, and the absence of surface streams.
- 4. Also called matrix density; the density of a unit volume of rock matrix at zero porosity.
- 8. A geophysical method in which bursts of electromagnetic energy are transmitted downwards from the surface, to be reflected and refracted by velocity contrasts within the subsurface.
- 11. Any device that converts an input signal to an output signal of a different form.
- 12. Subglacial volcanic deposits from eruptions beneath glacial ice.
- 13. The technique for forcing radiation, like gamma photons, into a beam.
- 14. The material thrown out from the crater during the impact that formed it.
Down
- 1. A measure of the offset between two periodic signals of the same frequency.
- 3. An empirical relationship linking formation resistivity, formation water resistivity and porosity.
- 5. A contact-resistivity probe that provides data from which the strike and dip of bedding can be determined.
- 6. Porosity developed in a rock after its deposition as a result of fracturing or solution.
- 7. Formed in the region where found.
- 9. In geophysical interpretation and mathematical modelling, a problem for which two or more subsurface models satisfy the data equally well.
- 10. An igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes.