Select the correct answers. Which two research questions would be best for narrowing the topic of a five-paragraph paper (300 words) on outer space? What causes volcanoes to erupt? How did Edmond Halley predict when Halley's Comet would return? In what part of the world is the deepest part of the ocean? How do the craters on the moon differ from one another? Why is Pluto no longer considered a planet? Reset Next​