Select from:
1). carbon monoxide;
2). nitrate acid;
3). methane gas;
4). carbonic acid;
Q: Answer the following question given this paragraph: Rainwater absorbs carbon dioxide (CO 2 ) as it falls. The CO 2 combines with water to form carbonic acid. The slightly acidic water is especially good at dissolving the rock limestone. Groundwater creates landforms by dissolving away rock. Q: Rainwater absorbs carbon dioxide (co 2 ) as it falls. the co 2 combines with water to form what? A:
A:
4).