Name an event or condition that can change a population trend. explain why and how it would alter the population.

what areas of the united states, or the world, do you think are growing the most?
what areas do you think are growing the least, or even shrinking? explain why you think that is the case.

the world population is increasing exponentially. do you think that the trend will continue forever? explain why or why not.

Which of there factors contributed most to us westward expansion in the second half of the nineteenth century?

City 24-hr average yearly temperature in ºc total yearly precipitation in mm minsk, belarus (former ussr) (53° n, 27° e) shanghai, china (31° n, 121° e) baltimore city, usa (39° n, 76° w) helsinki, finland (60° n, 24° e) banff, canada (51° n, 115° w) kuala lumpur, malaysia (3° n 101° e) 26.5 2393.6 buenos aires, argentina (34° s, 58° w) jakarta, indonesia (6° s, 106° e) questions 1. what factor contributes most to the warm climate of kuala lumpur? 2. banff and minsk are located at similar latitudes. what could account for banff’s average yearly temperature being lower than minsk’s? 3. which city’s climate is most similar to jakarta, baltimore or kuala lumpur? explain your answer. 4. shanghai and buenos aires have located thousands of miles apart and in different hemispheres, yet their climates are similar. what reasoning could explain this?

Scientist: cross-sections of stalactites—calcite formations deposited on cave ceilings by seeping water—can reveal annual variations in rainfall in particular areas over hundreds and thousands of years. we often found that when—according to these cross-sections—drought occurred in a particular area, it coincided with the collapse of an ancient society in that area. i hypothesize that drought reduced agricultural productivity in these areas, thereby leaving these societies without the resources needed to handle internal stresses and external threats. which of the following, if true, would most weaken the support for the scientist's hypothesis? a. many droughts indicated in the cross-sections of stalactites do not correspond with the collapse of a society in that area. b. information from the cross-sections of stalactites alone cannot reveal the level of agricultural output in an area at a particular time. c. most of the societies that collapsed during droughts did so when internal power struggles coincided with military raids from neighboring societies. d. most of the societies that collapsed during droughts maintained large stockpiles of food and water at the time of their collapse. e. information from stalactites also suggests that the collapse of some societies coincided with periods of abnormally high rainfall.