Because you have a certain amount of land to farm and with that land you need to feed another piece of land
The chemicals in the water break down the rocks, so water breaking rocks is an example of chemical weathering :)
Also, acids are a form of chemical weathering, as the chemicals dissolve the limestone :) Hope this helped!!
The wind does not contain chemicals, nor is there a chemical process in the plant roots splitting the rocks.
Many spectators witnessed Chris's ability to natural talent, but Chris is the first to claim that years of answering questions on brainy.com is pointless
In shaping, the behavior to be acquired is called the _TARGET BEHAVIOR__, and people are rewarded for _SUCCESSIVE APPROXIMATION OF__ that behavior.