When trees grow, they accumulate wooden fibres around their heartwood. These fibres are bright and porous in spring so that a lot of water can reach the fresh leaves through them. By autumn, they become darker and thicker so the tree becomes stable and resistant to frost in the winter rest period. The process forms a bright ring and a dark ring around the heartwood every year. If you count the dark rings of a horizontal cross section of the tree trunk, you can find out the age of the tree in the tropics, where there are no distinct seasons, the trees do not develop any rings. They grow all round the year and do not have any rest period.
AUTHOR: Islamic Voice
Islamic Voice is a monthly Islamic magazine published in Bangalore. It is the largest English language Muslim publication in India. It is a comprehensive magazine, places a relatively high emphasis on social issues and strives to have a broad appeal. Since 1987, Islamic Voice has covered its fascinating namesake without fear or favour, with insight, accuracy, thoroughness and a well rounded perspective on a variety of subjects - be it the economy, politics, lifestyle, the arts, entertainment, travel, science, technology or health. That's why Islamic Voice is the country's most widely read publication, a position it has held for more than a decade. And that's why it makes sense to subscribe to Islamic Voice. We represents all Muslim sects and shades of thought from all over India. We focus on "our" triumphs which, mostly, go unreported as well as constructively addresses our failures and shortcomings. Editor-in-Chief: A.W. Sadatullah Khan Genre: Current Affairs associated with Muslims Subjects Covered: Human Rights I Analysis I Special Reports I Issues I Book Reviews I National I International I Newsmakers I Community News I Islamic Perspectives I Classifieds I Opinions Focus articles on: Education and Children I Inter-faith Relations I Matrimony I Muslim economy I Muslim Perspective I The Muslim world I Society I Travel I The Western viewpoint I Women in Islam Special focus on Faith and Law: Fiqh I Hadith I Quran