By Measuring the CO₂ Concentration in the Vostok Ice Core

question 1

Multiple Choice

By measuring the CO₂ concentration in the Vostok ice core, scientists were able to show that atmospheric CO₂ concentrations fluctuated substantially over the last 160,000 years and periods of low atmospheric CO₂ concentration correspond with

• A) warmer interglacial periods.
• B) colder ice age periods.
• C) years of above average precipitation.
• D) years of below average precipitation.
• E) both warmer interglacial periods and years of below average precipitation.

---

Definitions:

Americans

Individuals who are citizens of the United States of America.

Chinese

Referring to anything related to China, including its language, culture, people, or geographic area.

Suffering

The experience of pain, distress, or hardship, which can be physical, emotional, or psychological in nature.

Reward

A benefit, often a form of compensation, given for performing a desired behavior, encouraging repetition of that behavior.