Increased seismicity (# quakes per day) and increased emission of gases (like carbon dioxide and sulfur dioxide) are two signs that can signal that a volcanic eruption is imminent. what is the most likely cause of these two precursors

Increased seismicity and increased gas emission means the building of pressure.

Explanation:

the correct answer is blue and green.

a visible spectrum is electromagnetic spectrum color that can be seen by a normal human being by a single wavelength of light. the visible light spectrum is the range of wavelengths that make up visible light. the visible light spectrum passes through a prism enabling the rainbow reveals all the colors in the spectrum. these range from red, orange, yellow, green, blue and violet.