You find a type of volcanic rock that is fairly smooth, and has only a few small holes made when gas and water vapor escaped as the rock cooled. you know that the rock can be classified as..

This rock is a type of volcanic rock called Scoria. They are generally dark-colored and have bubble-like cavities that are known as vesicles. They can be black, dark gray or deep reddish brown in color that has similar characteristics to basalt rocks. They form when gases and water vapor escape from the rock as it cools from a volcanic eruption when exposed to the outer environment.

carbon

explanation:

evidence and logical support is essential for a scientist to do in order to maintain credibility. this is because no one can believe without any logic and without any evidence.hence a scientist can maintain credibility by proving himself and by answering logically so experiments prove very beneficial. logical hypothesis give conclusion which is acceptable. therefore, there are two main factors to maintain credibility by a scientist is evidence and logical support.