Anything less that 7, would be a base.
It depends on what the remains are. If you are looking for a word, it could either be fossils or if it is something that has preserved the soft tissue it can be described as mummified.
Lava I think try that hope it helps :)
A. It is the reaction of an alkali metal with water.
B. Hydrogen , the test for hydrogen goes out with a squeaky pop.
C. Sodium + water —> sodium hydroxide + hydrogen
