The large magnitude of solar energy available makes it a highly appealing source of electricity. The United Nations Development Programme in its 2000 World Energy Assessment found that the annual potential of solar energy was 1,575â49,837 exajoules (EJ).
Definition of IRONWOOD. 1. : any of numerous trees and shrubs (as a hornbeam or hop hornbeam) with exceptionally tough or hard wood. 2.: the wood of an ironwood.See ironwood defined for kids.ADVERTISEMENT.. : any of numerous trees and shrubs (as a hornbeam or hop hornbeam) with exceptionally tough or hard wood. 2. : the wood of an ironwood. See ironwood defined for kids.
The wood of the yew is springy, and has a long history of use as a material for bows. Yew wood is also known for its durability. It has sometimes been called iron wood, because fence poles made from yew have outlasted metal ones.