An Earthquake is a sudden tremor or movement of the earth's crust, which originates naturally at or below the surface.The word natural is important here, since it excludes shock waves caused by French nuclear tests, man made explosions and landslides caused by building work. There are two main causes of earthquakes.n Earthquake is a sudden tremor or movement of the earth's crust, which originates naturally at or below the surface.
Definition of TANGRAM. : a Chinese puzzle made by cutting a square of thin material into five triangles, a square, and a rhomboid which are capable of being recombined in many different figures.See tangram defined for kids. ADVERTISEMENT.efinition of TANGRAM. : a Chinese puzzle made by cutting a square of thin material into five triangles, a square, and a rhomboid which are capable of being recombined in many different figures. See tangram defined for kids. ADVERTISEMENT.
Tang is a fruit-flavored drink. Originally formulated by General Foods Corporation food scientist William A. Mitchell in 1957, it was first marketed in powdered form in 1959. The Tang brand is owned by MondelÄz International.Sales of Tang were poor until NASA used it on John Glenn 's Mercury flight, and subsequent Gemini missions.Since then, it was closely associated with the U.S. manned spaceflight program, leading to the misconception that Tang was invented for the space program.ang was used by earlier NASA manned space flights. In 1962, when Mercury astronaut John Glenn conducted eating experiments in orbit, Tang was selected for the menu, and was also used during some Gemini flights.