Respuesta :

1 km = 1,000 meters 

9 km = 9,000 m 
19 km = 19,000 m

The thickness of the biosphere from the sea level is 28,000 meters.

What is the biosphere?

The biosphere is the part of the earth's ecosystem comprised of living and non-living organisms. It is the thin layer of the surface of the earth where life exists. It includes the fauna, flora, human beings, and microorganisms.

Given values:

Thickness above sea level (in metres)= 9,000 (9 km X 1,000 metres)

Thickness down sea level (in metres) = 19,000 (19 km X 1,000 metres)

Computation of the thickness of the biosphere:

[tex]\rm \ Thickness \rm\ of \rm\ biosphere=\rm\ Thickness \rm\ above \rm\ sea \rm\ level + \rm\ Thickness \rm\ down \rm \ sea \rm\ level\\\rm \ Thickness \rm\ of \rm\ biosphere= 9,000\ meters + 19,000\ meters\\ \rm \ Thickness \rm\ of \rm\ biosphere= 28,000\ meters[/tex]

Therefore, the biosphere's thickness in terms of meters is 28,000.

Learn more about the biosphere in the below-mentioned link:

https://brainly.com/question/2272996