The Riverside County Department of Waste Resources has several upcoming ways for residents to learn about composting.On Saturday, April 5, the Department will be hosting a free Backyard Composting and Make Your Own Worm Bin workshop from 9 a.m. to 1 p.m. at the department headquarters (14310 Frederick Street, Moreno Valley, 92553). Residents will learn how to transform organic materials, like yard trimming and produce waste, into a nutrient-rich soil conditioner.The composting instruction and demonstration will begin at 9 am. Instructors with over a decade of experience will explain how bacteria digest organic material to create compost. Low-cost compost bins are available for $18 (limit three per household). The Vermicomposting and Make Your Own Worm Bin workshop will begin at 10