Across
- 4. the process of determining if one rock or geologic event is older or younger than another, without knowing their specific ages
- 6. a rock unit that is distinctive enough in appearance that a geologic mapper can tell it apart from the surrounding rock layers.
- 7. an expert in or student of geology
- 8. the elevated boundary between areas that are drained by different river systems
Down
- 1. investigates the Earth's climate, surface environments, and life, and how they interact and influence one another through time.
- 2. any of various processes and phenomena associated with the surficial discharge of molten rock, pyroclastic fragments, or hot water and steam, including volcanoes, geysers, and fumaroles.
- 3. determining a chronology or calendar of events in the history of Earth
- 4. calculates an age in years for geologic materials by measuring the presence of a short-life radioactive element
- 5. determining a chronology or calendar of events in the history of Earth