Question 14 air masses usually near the equator becausemakes the air more oa rise, greater solar radiation and surface heating, buoyant ob. rise, less solar radiation and surface heating, dense oc. fall greater solar radiation and surface heating, buoyart o d. fall, less solar radiation and surface heating, dense question 15 the study of how organisms in an area are influenced by factors such as climate, soils, predators, competition and evolutionary history would best be termed: a. ecology o b physiological ecology .natural history d. synecology e ecosystem ecology

Distance that the transcontinental railroad covered from omaha to san francisco.

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.

The fact that similar fossils are found on both sides of the ocean is evidence of: a. global positioning. b. magnetic reversal. c. continental drift. d. oceanic drifts. select the best answer from the choices provided a b c d