What is the purpose of stone keep castle?

Infected and affected dentin? How far is it across the wideset point of the Grand Canyon? Why do life-forms in the deep ocean have to have unusual adaptations? What do the termites in the Sahara desert eat? Places to touch a guy to turn him on? Why did Superman become bizzaro at Six Flags? What animals eat snails in the ocean? What a beam bridge consists of a horizontal beam supported? What do you call the guards that guard the Sistine Chapel in Rome? Why are sand and shingle beaches different? Which battles took place in the great lakes region? What facts describe the Erie Canal? What is the climax in young fu of the upper Yangtze? What states do vanpire bats live? What is good and bad about zoos? How deep is surigao deep? How many grains of sand are there in Coronado beach? Is madubu gorge real? Glacier in a sentence? What you call a part of sea filling wide mouthed opening of the land?