What is the long-term effect of using untreated wood outdoors?

Using untreated wood outdoors leads to rapid deterioration due to exposure to the elements. Wood is a natural material that is susceptible to moisture, ultraviolet rays from the sun, and various biological factors such as fungi and insects. When untreated, wood absorbs moisture from rain or humidity, which can cause swelling, warping, or cracking. Additionally, without preservatives, wood is left vulnerable to rot and decay, which significantly reduces its lifespan. The long-term exposure to harsh weather conditions results in the wood degrading more quickly, leading to structural issues and the potential for failure over time. Thus, the choice indicating rapid deterioration accurately captures the consequence of using untreated wood in outdoor environments.