Carbon Dioxide

This 11-question quiz looks at carbon dioxide, the gas we breathe out and plants take in.

You will answer fill-in-the-blank and true or false items, with prompts such as What is the solid form of carbon dioxide? and Carbon dioxide is absorbed by trees and plants during ___.

One of the more surprising facts is that the solid form, known as dry ice, skips the liquid stage entirely and turns straight into a gas, a change called sublimation.

You will also touch on where the gas comes from and why it can be dangerous in large amounts.

Recommended level: intermediate.