Question

question 3 1 pts magma rises because
○ it is more dense than the surrounding material
○ it secretly wants to be a lava lamp
○ it is the same density as surrounding material
○ it is less dense than surrounding material

Explanation:

To determine why magma rises, we use the principle of density in geology (a subfield of Natural Science). In fluid dynamics (and for materials like magma in the Earth's mantle), a substance rises when it is less dense than the surrounding material because less dense substances are buoyant and move upward relative to denser surroundings. The option "It secretly wants to be a lava lamp" is a humorous, non - scientific statement. If magma were more dense or the same density as the surrounding material, it would not rise (more dense would sink, same density would not have a net upward movement). So the correct reason is that magma is less dense than the surrounding material.

Answer:

D. It is less dense than surrounding material