Dry ice is composed of frozen solid what?

Dry ice is composed of frozen solid carbon dioxide. When carbon dioxide gas is pressurized and cooled, it transitions into a solid state without passing through a liquid phase, a process known as deposition. This makes dry ice useful for applications such as refrigeration and creating fog effects, as it sublimates back into gas at temperatures above -78.5 degrees Celsius (-109.3 degrees Fahrenheit).

The other options do not correctly describe the composition of dry ice. Water is a liquid at room temperature and freezes to become ice, while oxygen and nitrogen are gases in their natural state at room temperature and do not form solids in the same way that carbon dioxide does. Understanding the unique properties and behavior of carbon dioxide helps clarify why dry ice serves as a versatile tool in various scientific and practical applications.