Accessibility Even if plenty of water is provided, there may be other limits to its use, such as the time taken for people to travel and queue to collect it. If it takes more than 30 minutes to collect water, the amount they will collect will reduce (see Figure 9.4).
. See also Geologic(al) time scale (below). Geologic(al) time scale: a system of chronologic measurement relating stratigraphy to time that is used by geologists, paleontologists and other earth scientists to describe the timing and relationships between events that have occurred during the history of the Earth.
enables scientists from around the world to correlate the geologic events, environmental changes, and the development of life-forms that are preserved in the rock record. GEOLOGIC TIME The oldest division of time is at the bottom of the geologic time scale. Moving upward on the scale, each division is younger, just as