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
What We Do Is Secret (novel) What We Do Is Secret (novel) What We Do Is Secret is a novel by Thorn Kief Hillsbery, published by Villard in 2005. "What We Do Is Secret" takes place in Los Angeles in 1981, six months after the death of Darby Crash (lead singer of the Germs). It is narrated by a gay street kid named Rockets Redglare, who knew Darby personally. All the action occurs over the course of 24 hours, on Rockets' 13th birthday. Rockets was ten years old when he first met Darby Crash, lead singer of LA punk band the Germs. He and Darby had