In general, volcanoes eject which gas the most?

Superheated water vapor is the most common gas released during volcanic eruptions. Water vapor can account for 97 percent or more of total gas emissions from a volcano, but can also be a relatively minor discharge in some volcanoes.

Explanation:

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.

answer; the above statement/question is (false);