Wood is a natural, versatile material that has been used by humans for thousands of years:  Composition Wood is made up of cellulose, a polymer that forms strong fibers, and lignin, another polymer that's typically amorphous.  Structure Wood is a hard, fibrous material that forms in concentric layers around a central core called the pith. The lighter area around the heartwood is called sapwood, and the darker central portion is called heartwood.  Properties Wood is strong,...

we should always plant trees and do not cut trees because trees give us oxygen, paper, food, wood (etc) there are many types of trees like mango tree , pine tree ,banana tree (etc)

#earthvisit

Let's make it happen you and me and everyone can achieve it Let's dream it