Which of the Following Accurately Describes ¹⁸O/¹⁶O Ratios of Ice

question 21

Multiple Choice

Which of the following accurately describes ¹⁸O/¹⁶O ratios of ice sheets?

• A) During warmer periods, ¹⁸O evaporates more readily and therefore the ¹⁸O/¹⁶O ratio is higher.
• B) The higher the ratio of ice core ¹⁸O/¹⁶O, the cooler there temperatures because the ¹⁸O will be locked up in ice sheets.
• C) During periods of colder temperature, the ¹⁸O/¹⁶O ratio is higher because only the ¹⁸O isotope is being evaporated.
• D) During warmer periods, ¹⁶O evaporates more readily and therefore the ¹⁸O/¹⁶O ratio is significantly lower than colder periods.

---

Definitions:

Major Rule

A significant regulatory measure or policy that has a large impact on the economy, society, or government operations.

Administrative Rule

Regulations issued by government agencies to implement laws, detailing the standards and procedures for enforcement of those laws.

ALJs

Administrative Law Judges are officials who preside over hearings and dispute resolutions involving federal regulatory agencies.

Professional Merit Selection

A system of appointment based on qualifications and performance rather than political connections or personal favoritism.