Can you help me with this science question:

from sea level, the biosphere goes up about 9km and down about 19km. What is the thickness of the biosphere in meters?

(there wasn't a formula in the workbook).

Thanks

.19 is the answer

1 km = 1,000 meters

9 km = 9,000 m
19 km = 19,000 m

Right. You're welcome.

What is the answer to(how many meters is the Biosphere )(thickness).

Plus I’m in 5gd.

Bro who no the answer

oh! I see. I thought i needed a formula. 9000m + 19000m = 28000m Thanks!

Help me i dont know the anwser

I need the answer

analyzing relationships what would happen to the other organisms in the salt-marsh ecosystem if the cordgrass suddenlydied?