1-C. Wood is often painted to prevent sharp changes in moisture content, which cause expansion and shrinkage.Wood is often painted to prevent sharp changes in moisture content, which cause expansion and shrinkage.
2-C. These changes in size due to shrinkage are not uniform because changes depend on the kinds of trees, the way trees are cut, and the surrounding conditions.These changes in size due to shrinkage are not uniform because changes depend on the kinds of trees, the way trees are cut, and the surrounding conditions.
3-C. This shrinkage is caused by moisture water within the wood escaping into the atmosphere.This shrinkage is caused by moisture water within the wood escaping into the atmosphere.