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.
Just as the terms softwood and hardwood refer to a variety of types of wood, there is no single species that can lay claim to the designation ironwood.. Over 100 species of trees and shrubs could earn that designation, and each continent has more than one example.frican Ironwoods. Several species in tropical Africa could easily earn the designation ironwood, and one that has is Lophira alata, commonly known as ekki, azobe or red ironwood. This deciduous tree can grow as tall as 46 meters (150 feet), and the wood has a Janka rating of 3,220 pound-feet (14,330 Newtons).