They are always microscopic. They are closer to the sun than to Earth. They are made of soft, spongy materials. They burn up high in Earth's atmosphere
I gave my students this multiple choice question: At certain times of the year, meteor showers can be observed from Earth. Why are these objects from space usually harmless?

Only one answer is correct among these 4 choices:
- They are always microscopic.
- They are closer to the sun than to Earth.
- They are made of soft, spongy materials.
- They burn up high in Earth's atmosphere

Could you tell me which one is correct?

They burn up high in Earth's atmosphere