Geodesists define the geoid as:. a. a mathematical shape that lies just below the lowest point on Earth. b. the gravitational surface upon which water would rest. c. the reference point for geodetic surveys. d. the coordinate system by which land parcels are subdivided.

Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number. the probability that the locker code begins with a prime number is %. the probability that the last digit of the locker code is an odd number is %.

Ozone in the upper atmosphere has been depleted by a. sulfur dioxide. b. chlorofluorocarbons. c. carbon dioxide. d. oxygen.

Use your vocabulary words to complete the sentences below. australia and new zealand are in nature meaning they are located between temperate and tropical climates. oceania, on the other hand, has a tropical climate with numerous island chains, many of which are home to , which are islands made from coral. this entire region rests on the edges of plates, and therefore they are prone to earthquakes, volcanoes, and tsunamis. since most of the islands were formed from volcanoes, rock can be found everywhere.