Properties of water equal to that of the hydrogen ion (), which gives a pH of 7 at 25 °C. Action of water on rock over long periods of time typically leads to weathering and water erosion, physical processes that convert solid rocks and minerals into soil and sediment, but under some conditions chemical reactions with water occur as well, resulting in metasomatism or mineral hydration, a type of chemical alteration of a rock which produces clay minerals. It also occurs when Portland cement hardens. Water ice can form clathrate compounds, known as clathrate hydrates, with a variety of small molecules that can
Lady in the Water ten films of 2006, above films such as Terrence Malick's "The New World". The film was released simultaneously on DVD, HD DVD, and Blu-ray by Warner Home Video on December 19, 2006. Lady in The Water is the only M. Night Shyamalan film that was ever released on HD DVD. Shyamalan, who credits the development of the movie to a bedtime story he told his children about what happens in their pool at night, wrote the 72-page children's book "Lady in the Water: A Bedtime Story" (Little, Brown, New York, ) to coincide with the movie. The book's illustrations were