Define the word catastrophic

Simple astronomical telescope the objective lens has a focal length of 75 cm and that of a piece of 5cm of the lenses are 18 cm apart when will be final image of a distant object before

b) is there any ordinal sense to zip codes? in other words, does a larger zip code tell you anything about a location compared to a smaller zip code?

The majority of russians who follow the religion of islam can be found in the part of russia. a. southern b. northern c. eastern d. western