Q: What is another term for dry ice?


Read this paragraph and choose the correct option from the provided answers:

Solid carbon dioxide is also called dry ice. That’s because when it gets warmer and changes state, it doesn’t change to a liquid by melting. Instead, it changes directly to a gas without going through the liquid state. The process in which a solid changes directly to a gas is called sublimation . It occurs when energy is added to a solid such as dry ice. You can watch dry ice changing directly to a gas in the video at this URL: http://www. youtube. com/watch?v=J8mDGwf-5x0 .

 Choices:

- liquid nitrogen

- ice crystals

- carbonated ice

- solid carbon dioxide


A:
solid carbon dioxide