It helps create a heat source from underneath for different types of plants.
It also has created land when it has reached the surface.
The best example of dramatic<span> irony in Act 1, Scene 4 of Macbeth is when Duncan says he trusts Macbeth, and the audience knows that Macbeth is expecting to become king. Macbeth is not at all trustworthy! </span>Dramatic<span> irony is when the audience knows something that the characters do not.</span>
The answer is I was unsure how to react.
Hope this helped :)