The migration transition model predicts that high international emigration and interregional rural-to-urban migration reaches a peak at of the demographic transition.

How does cloud cover affect how much infrared light is reflected back to the ground?

Which type of market produces the highest level of output at the lowest price to consumers?

As you drive in to school, you hear a random radio-show caller arguing that sun exposure really has not been shown to cause skin cancer and that some research suggests that skin cancer is completely genetic and not related to sun exposure at all. at the time, you think that this is a silly argument and that the caller does not know what she is talking about. however, two months later, you are outside without wearing sunscreen, and you find yourself remembering that you had read something about how the sun actually does not cause skin cancer. this process is evidence that has influenced your attitude