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| carbon dioxide |
Carbon dioxide is a gas that is made up of the chemical elements oxygen and carbon. This gas has no color or smell. Carbon dioxide is produced in many different ways. People put a little carbon dioxide into the air every time they breathe out. Carbon dioxide is also made by the burning of fuels, and it is created when plants die and decay. Carbon dioxide is often written CO2 and pronounced "see oh two." |
| dear |
When someone says, "Oh, dear," it means that they are surprised by something bad or they are suddenly worried about something. [1/5 definitions] |
| exclamation |
a single word or phrase that is said when a person has strong feelings. "Wow!" is an exclamation that people use when they are surprised or amazed. "Oh, dear!" is an exclamation that people use when something disappoints or worries them. [1/2 definitions] |
| interjection |
a word or expression that shows strong feeling; exclamation. "Oh no!" and "Oops!" are examples of interjections. |
| oh |
"Oh" is something we often say without thinking. It doesn't have any real meaning, but we often say it when we are surprised or when we have some strong feeling. Sometimes we say it when someone tells us a thing that we didn't know before. |
| Ohio |
a state in the midwestern United States. Its capital is Columbus. (abbreviated: OH) [1/2 definitions] |
| recognition |
Recognition is what happens when you realize that you know someone or something. It's your mind thinking, "Oh, yes. I know that person" or "Oh, yes. I know what that thing is." [1/2 definitions] |
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