most full circle represents the percentage of energy used in the United States for electricity, heat, and transportation that is nonrenewable.
In the US, only 10% of energy comes from renewable sources (mostly hydroelectric energy). Nonrenewable sources makes up 85% of worldwide energy usage—from sources that eventually will be depleted, such as oil, natural gases and coal.
Friction and Tectonic Chemical Weathering Physical Weathering Wind and Water Erosion <span> http://classroom.synonym.com/natural-activities-work-break-down-rock-16920.html
I know that we aren't suppose to paste websites but I believe that this information is necessary, I hope this helped, sorry!</span>
