Structure of the Earth obducted onto the continental crust and preserved as ophiolite sequences. Many rocks now making up Earth's crust formed less than 100 million (1) years ago; however, the oldest known mineral grains are about 4.4 billion (4.4) years old, indicating that Earth has had a solid crust for at least 4.4 billion years. Earth's mantle extends to a depth of 2,890 km, making it the thickest layer of Earth. The mantle is divided into upper and lower mantle. The upper and lower mantle are separated by the transition zone. The lowest part of the mantle next to the core-mantle boundary is
The World Is What It Is in 1996. The biography has been extensively reviewed: the reviewers include Paul Theroux, who wrote an earlier book about Naipaul. The biography was selected by the editors of the "New York Times Book Review" as one of the "Times"' "10 Best Books of 2008". It won the 2008 National Book Critics Circle Award in Biography, and the British literary award the Hawthornden Prize. The World Is What It Is The World Is What It Is: The Authorized Biography of V. S. Naipaul is a biography of the Nobel Prize-winning author V. S. Naipaul by Patrick French. It was published in