Abundance of the chemical elements of the volatile elements hydrogen, helium, neon, and nitrogen, as well as carbon which has been lost as volatile hydrocarbons. The remaining elemental composition is roughly typical of the "rocky" inner planets, which formed in the thermal zone where solar heat drove volatile compounds into space. The Earth retains oxygen as the second-largest component of its mass (and largest atomic-fraction), mainly from this element being retained in silicate minerals which have a very high melting point and low vapor pressure. The mass-abundance of the nine most abundant elements in the Earth's crust is approximately: oxygen 46%, silicon 28%, aluminum 8.2%,
The Elements of Moral Philosophy died. Since then, his son Stuart has written the fifth edition and the sixth edition, which was released in April 2009. An 8th edition was released in October 2014. The book has been translated into Italian, Portuguese, Chinese, Indonesian, Korean, Spanish, Norwegian, Swedish, Persian and Albanian. It is known for its accessibility to a wide readership. David Fordyce wrote a book with the same title—however, aside from the titles, these books are largely unrelated. The Elements of Moral Philosophy The Elements of Moral Philosophy, by James Rachels and Stuart Rachels, is an ethics textbook. It explains a number of moral