Basic Geophysics Formulas comprises a selection of 5 different calculators that will simplify calculations which have given you headaches so far. Complex calculations, such as Luminosity of Stars, Orbital Speed and others listed below will be handled easily with this app. CALCULATORS: > Wenner Spacing Soil Resistivity > Seismic Geophone > Luminosity of Stars > Orbital Speed > Topsoil Bulk Density FEATURES: - Formula and description for each calculator - Copy / Paste params and results - Clean, simple and easy to use. If you have any question please contact us: veghferencrobert@yahoo.com All information contained in and produced by the Basic Geophysics Formulas app is provided for educational purposes only.