Wood is a renewable industrial raw material.

During photosynthesis, trees convert carbon dioxide, water, and _____________________________ into wood fiber.

Wood is ________________________, meaning that it will decay into harmless, non-polluting substances.

Wood insulates six times better than brick or_______________________.

Over three-quarters of the homes built in the United States have ___________________ frames.

All known forms of combustion release oxygen.

Trees consume carbon dioxide and release ________________________.

Trees help protect soil by preventing ______________________ caused by runoff from rain or melted snow.

The air pollutants that harm trees are sulfur dioxide, ozone, and ethylene.