Which stable element is used to determine the age of volcanic rock?

argon
carbon-14
potassium
carbon-12

What makes water a renewable source

The primary purpose of a certificate of confidentiality is to: allow law enforcement to investigate abuse cases.protect researchers from disclosing conflicts of interest.prevent subjects from knowing the purpose of a study.protect identifiable research information from compelled disclosure.

To create the proper tone for an argumentative essay, writers should delete personal “i” statements. include vague statements. remove any slang words. focus on the evidence.