Loggerhead sea turtle Greek coast, the coastlines of Cyprus and Turkey are also common nesting sites. One record of this turtle was made in Ireland when a specimen washed ashore on Ballyhealy Beach in Co. Wexford. Loggerhead sea turtles spend most of their lives in the open ocean and in shallow coastal waters. They rarely come ashore besides the females' brief visits to construct nests and deposit eggs. Hatchling loggerhead turtles live in floating mats of "Sargassum" algae. Adults and juveniles live along the continental shelf as well as in shallow coastal estuaries. In the northwestern Atlantic Ocean, age plays a factor in
History of manifolds and varieties History of manifolds and varieties The study of manifolds combines many important areas of mathematics: it generalizes concepts such as curves and surfaces as well as ideas from linear algebra and topology. Certain special classes of manifolds also have additional algebraic structure; they may behave like groups, for instance. In that case, they are called Lie Groups. Alternatively, they may be described by polynomial equations, in which case they are called algebraic varieties, and if they additionally carry a group structure, they are called algebraic groups. The term "manifold" comes from German "Mannigfaltigkeit," by Riemann. In English, "manifold" refers to