Time zones are measured in relation to their distance from

In the diagram below, ab and bc are tangent to o. what is the measure of

The declining axolotl population in mexico city is an example of in overcrowded cities. a. the surpassing of support capacity b. changes to natural environments and native species c. the lack of safe homes and tenured spaces d. the effects of a growing urban heat island

Which type of map gives the most information about what lies below the surface terrain ?