m61.    Who recycles solids wastes?

In U.S. about 17% of municipal waste are recycled, and in Japan 40% of municipal waste recycled. In high technology materials recovery facilities machines shred and automatically separate mixed urban waste to recover. Glass, iron, aluminum and other valuable materials can be recycled. Low-technology resource recovery puts different kinds of waste materials into separate containers. Primary, or closed loop, recycling allows products that are recycled to produce new products of the same type. Secondary, or open loop recycling converts waste materials into different products.

g16.    What is matter?

g17.    Is some matter more useful than other matter?

g18.    What is energy?

g27.    How fast are supplies of mineral being used up?

g21.    Can we mine the oceans?