Indicator which can be used to compare the value or level of a statistic with its value or level at an earlier point in time, accounting for changes due to factors such as price ...
A quantitative measure, usually of something the measurement of which is not straightforward, such as an average of many diverse prices, or a concept such as economic development ...
Areas with an average monthly precipitation of 60mm qualify as having a tropical rainforest climate. These are usually within 5-10° latitude of the equator.