Parasitic Diseases. Photo by: Jubal Harshaw. Parasitic diseases are illnesses caused by infestation (infection) with parasites such as protozoa (one-celled animals), worms, or insects. These diseases are widespread in Africa, southern Asia, and Central and South America, especially among children.arasitic Diseases. Photo by: Jubal Harshaw. Parasitic diseases are illnesses caused by infestation (infection) with parasites such as protozoa (one-celled animals), worms, or insects. These diseases are widespread in Africa, southern Asia, and Central and South America, especially among children.
Definitions for tectonictÉkËtÉn Éªk. tectonic(adj) pertaining to the structure or movement of the earth's crust. tectonic plates; tectonic valleys. tectonic, architectonic(adj) of or pertaining to construction or architecture.
Geologists have an explanationâa scientific theoryâof how the Earth's surface behaves called plate tectonics. Tectonics means large-scale structure. So plate tectonics says that the large-scale structure of the Earth's outer shell is a set of plates. (see the map) Tectonic Plates. Tectonic plates don't quite match the continents and the oceans on the Earth's surface. The North America plate, for instance, extends from the west coast of the U.S. and Canada into the middle of the Atlantic Ocean.