15. on a surface weather map, a stationary front is drawn in purple. 16. the top part of a thunderstorm usually has a negative charge. 17. on average, cities tend to be warmer and more polluted than rural areas. 18. when the base of an inversion lowers, pollutants are able to be dispersed throughout a greater volume of air. 19. the terms typhoon and cyclone refer to the initial weaker stages in development of a hurricane. 20. the region of strong winds of a jet stream is called a jet maximum or jet streak.

What is the difference between external & internal migration

What was apartheid and how did it restrict the rights of non-whites?

The hypothetical island country of gilder lies in the mediterranean sea off the coast of france. demographers have studied gilder for the past 50 years. at the beginning of the study, gilder had a population of 20 million. the demographers have measured birth and death numbers, as well as immigration and emigration numbers, as shown in the data table. from the data, calculate the population of gilder for each 10-year period by filling in the population (no) and population (nt) columns in the data table. use this formula to do your calculations: population size: nt = no + (b + i) – (d + e)initial population = 20,000,000