Question

the sky is falling
1 shooting stars, or meteors, are bits of interplanetary material falling through earths atmosphere and heated to incandescence. these objects are called meteoroids when hurtling through space, only becoming meteors for the few seconds they streak across the sky and create glowing trails.
2 several meteors per hour can usually be seen on any given night. sometimes the number increases dramatically; these events are termed meteor showers. some of these meteor showers occur annually or at other regular intervals as earth passes through the trail of dusty debris left by a comet. meteor showers are usually named after a star or constellation that is
what is the main focus of the text?
how meteors can be harmful to life yet useful to scientists
why meteorites are both rarer and more important than meteors
how meteoroids, meteors, meteor showers, and meteorites are defined
what meteors and meteorites are, and how they are significant

Explanation:

The text first defines meteors (shooting stars) as interplanetary material heating up in Earth's atmosphere and meteoroids as those objects in space. Then it explains meteor showers (increased meteor numbers, named after stars/constellations, related to Earth passing through comet debris trails). There is no mention of harmfulness/usefulness to scientists (first option), no comparison of meteorites' rarity/importance (second option), and no full - fledged definition of meteorites (fourth option). It mainly focuses on defining meteoroids, meteors, and meteor showers.

Answer:

how meteoroids, meteors, meteor showers, and meteorites are defined