TopRq.com

Freezing or solidification is a phase change in which a liquid turns into a solid when its temperature is lowered below its freezing point. The reverse process is melting. All known liquids, except liquid helium, freeze when the temperature is lowered enough. Liquid helium remains liquid at atmospheric pressure even at absolute zero, and can be solidified only under pressure...

China is seen variously as an ancient civilization extending over a large area in East Asia, a nation and/or a multinational entity. With nearly 4,000 years of continuous history, China is one of the world's oldest civilizations. Prior to the 19th century, it possessed one of the most advanced societies and economies in the world; but through successive dynasties it then missed the Industrial Revolution in Europe and began to decline...

Freezing or solidification is a phase change in which a liquid turns into a solid when its temperature is lowered below its freezing point. The reverse process is melting. All known liquids, except liquid helium, freeze when the temperature is lowered enough. Liquid helium remains liquid at atmospheric pressure even at absolute zero, and can be solidified only under pressure...

An earthquake (also known as a quake, tremor or temblor) is the result of a sudden release of energy in the Earth's crust that creates seismic waves. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time. Earthquakes are measured using observations from seismometers. The moment magnitude is the most common scale on which earthquakes larger than approximately 5 are reported for the entire globe...

A fountain (from the Latin "fons" or "fontis", a source or spring) is a piece of architecture which pours water into a basin or jets it into the air either to supply drinking water or for decorative or dramatic effect. Fountains were originally purely functional, connected to springs or aqueducts and used to provide drinking water and water for bathing and washing to the residents of cities, towns and villages...