Thoracic cavity. Written By: Thoracic cavity, also called chest cavity, the second largest hollow space of the body. It is enclosed by the ribs, the vertebral column, and the sternum, or breastbone, and is separated from the abdominal cavity (the bodyâs largest hollow space) by a muscular and membranous partition, the diaphragm.
San Cristobal cristÃ³bal is A dominican city and the head municipality of The San cristobal. CristÃ³bal province the city is only 26 km from the national, capital and because, of that it is a city where many people live but Work At. santo domingoan Cristobal cristÃ³bal is in a small; valley the valley has small hills around it except along The River. Nigua nigua is the most important river of the; region another river Is yubazo Or, blanco a tributary Of. Nigua the municipality has a total area of.226 52. km2
Cristobalite is a rock-forming mineral, and occurs as a transitional silica polymorph in the form of opal-C (opal made of tiny cristobalite spheres) during the diagenesis of sediments made of opaline skeletons of marine organisms. It will slowly be converted into quartz (chalcedony or microquartz) with time.nder normal geologic conditions lechatelierite does not form. The temperatures found in the Earth's crust are too low to melt quartz sand, and even if there was a quartz melt, the cooling process would also be too slow to allow for an amorphous glass to form.