Detailed research on comets indicates that they cannot be older than years.

2000

Explanation:

although hayley comet was around 10,000 years old,the average comet it 2000

the answer is 10,000 years

Explanation:

I'm busy with this right know so the guy on top is wrong on my options 2,000 is not a option. 10,000 is I even went to go search it and quizlet even said 10,000 and I searched on its self, and somebody ask the same q so the first person said 1,000, and it was in my options and, the second person said "100.000 or 10,000". I say 10,000 too cuz read through stuff and I evidence that I'm right. So yeah hope this helps also leave a like and if I was right give me a few stars or even 5 if you would like.

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explanation:

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.