A few meters of soil was underlain by bedrock. Bottom of hole was at a depth of 45 m. Post-drilling measurement of the uncased borehole gave a pH of 11.4. Core was recovered only from primary hole at ...

“The pH scale extends from 0 (a very strong acid) to 14 (a very strong alkaline or base), but most soils will have a pH range of 4 to 8.5,” they said. “Pure water is neither an acid nor a base and is ...

At close: May 9 at 4:00:01 PM EDT ...

At close: May 9 at 4:00:01 PM EDT ...