Please, explain what does it mean: Write a paragraph from the book that has no voice? I know, that some books have stong voice, medium voice.

Thank you.

no voice? Written without personality, without feeling, without dialogue.

Here is an example:
<<The first 40 to 50 mi (64-80 km) above the earth contains 99% of the total mass of the earth's atmosphere and is generally of a uniform composition, except for a high concentration of ozone, known as the ozone layer , at 12-30 mi (19-50 km). Calculated according to their relative volumes, the gaseous constituents of the atmosphere are nitrogen, 78.09%; oxygen, 20.95%; argon, 0.93%; carbon dioxide, 0.03%; and minute traces of neon, helium, methane, krypton, hydrogen, xenon, and ozone. The lower atmosphere contains varying...>

Frankly, as Dolly Parton observed, it is hard to speak or write without your own voice.