Carbonate Capacitor (IMAGE) Rice University Caption This diagram illustrates how fluctuations between continental-arc states and island-arc states could lead to episodic deposition and purging of carbon dioxide in Earth's continental crust. Credit C. Lee/Rice University Usage Restrictions Must credit: C. Lee License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.