Earth System Science Vocabularies Part IV: Time and the Earth System part of ESS Vocabulary
Measuring/Understanding Time Principle of Uniformitarianism The principle that the geological forces of the past differ neither in kind nor in energy from those now in operation. By its emphasis on the cumulative ...

Earth System Science Vocabularies Part III: Earth System Environments part of ESS Vocabulary
Earth Structure inner core The center part of the earth's core, extending from a depth of about 5100 km to the center (6371 km) of the earth; is probably solid outer core The outer or upper zone of the ...