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.
Absolute geologic time places ages on geologic events or units. Relative time gives qualitative comparisons between events. Example of absolute geologic time: Rock A is 400 million years old. Example of relative geologic time: Rock B is younger than Rock A, but older than Rock C. It would be like saying: I am 35 years old (absolute time), and am older than my brother (relative geologic time).