sentence: Some maps show differences of temperature.
sentences_before: A 'weather map' is a tool. It is used to show facts and study of many kinds of meteorological amounts at different levels of the atmosphere quickly. They have been used from the mid-19th century. Weather maps have been used both for study and for weather forecasting purposes.
sentences_after: This can help find weather fronts.
concept_name: map
headings: Weather map
categories: Meteorology