How are the ten ecoregions of Texas determined? What properties make them different from one another?

Density and boiling point

Explanation:

There are properties of matter that do not change regardless of how much of the substance you have. The boiling point of a cup of water, for example is te same as the full kettle of water. These are called intensive properties. Examples include, but are not limited to, density , specific heat capacity , hardness, boiling point , color  etc