Hey buddy,
I believe the answer should be
→ <span>By mass, </span>one half<span> of the atmospheres volume </span>lies below<span> an </span>altitude of<span> 5.6 kilometers</span>←
Radio waves are electromagnetic waves and as such travel at the speed of light. Waves emitted a century ago would be 100 hundred light years away. A light year is the distance light travels in one year. In one year light travels about 5.9 trillion miles. therefore the waves traveled about 590 trillion miles in a century.
The answer to the question is the total surface area increases and chemical composition changes. Consider the breakdown of rock into smaller pieces, these fragments vary from huge rocks to smaller sizes. As they are so crushed and broken they tend to occupy much of the surface area than when its just a huge rock.
There are no untrue statements on the list you have provided.
