Humus is not just soil, it is a community of living things. Organic matter is a breeding ground for many types of microbes, including bacteria and fungi which break down plant material, and for other microorganisms that help plants roots absorb necessary nutrients.
I agree with your analysis, but I disagree that cagers refers to an entire class of persons, all motor vehicle drivers. To me, and maybe I am not using the right definition, a cager is an @sshole motor vehicle driver.
Phonetics: ridÂ·er \'rÄ«-dÉr\. Definition 1: Riders (or addenda) are special attachments (separate sheets) that become part of the contract in certain situations. There could be multi-state riders, prepayment riders, adjustable rate riders, convertible adjustable rate riders, construction riders, etc.