Native Americans of the northwestern region of America were fond of using cedar wood for many reasons. Which of the following is NOT one of the reasons cedar wood was a popular medium?

It is impermeable to weather.

It has a distinct aroma.

It is insect resistant.

It is soft and easy to manipulate.

It is impermeable to weather.

The correct answer is "It is soft and easy to manipulate." This is NOT one of the reasons cedar wood was a popular medium among Native Americans of the northwestern region of America.

In order to determine which of the given options is not a reason why cedar wood was popular among Native Americans of the northwestern region of America, we can analyze each option individually.

1. "It is impermeable to weather." - Cedar wood is known for its natural resistance against decay and weathering, making it an ideal choice for constructing structures that are exposed to the elements. Therefore, this option could be a valid reason why cedar wood was popular.

2. "It has a distinct aroma." - Cedar wood has a strong and pleasant scent, which can repel pests and insects. Oftentimes, Native Americans would use cedar to store food or clothing, taking advantage of its aroma to deter insects. Thus, this option could also be a valid reason.

3. "It is insect resistant." - Cedar wood is naturally resistant to insects due to its chemical properties. The aromatic compounds found in cedar, such as thujaplicin, act as a natural insect repellent. Therefore, this option is indeed a reason why cedar wood was popular.

4. "It is soft and easy to manipulate." - Unlike other wood types, cedar wood is generally softer and easier to work with, making it a favorable material for carving and crafting various objects. This flexibility and workability would make this option a reason why cedar wood was popular.

Based on this analysis, it appears that all of the given options could potentially be reasons for the popularity of cedar wood. Therefore, none of these options is NOT one of the reasons cedar wood was a popular medium among Native Americans of the northwestern region of America.