The Origin of Continents and Oceans (Although excluded from public

(Although excluded from public

opening the first American birth control clinic in 1916 and serving as the first president of the International Planned Parenthood Federation in 1953

cast in the form of letters to a student

Russian author

books on chemical systems

The Origin of Continents and Oceans (Although excluded from publicSince its inception modern geology has been faced with an important group of problems: explaining parallel formations that are separated by great distances of sea; accounting for isolated life forms in widely separated areas (such as lemurs in Madagascar and India); explaining pre pleistocene glaciations, and similar problems. The usual explanation has been to assume the one time existence of land bridges (such as the hypothetical Lemuria) or