* Human time is measured in units we experience directly: seconds, minutes, hours, days, years, decades, etc. It's the timeframe we use to understand our personal lives, history, and current events.

* Geologic time encompasses vast stretches of time, measured in millions and billions of years. It's the timescale used to understand the Earth's history, from its formation to the present day.

Here's a table that highlights the key differences:

| Feature | Human Time | Geologic Time |

|--------------------|-----------------------------------|--------------------------------------|

| Scale | Seconds, minutes, years, centuries | Millions, billions of years |

| Units | Hours, days, weeks, months, years | Eras, periods, epochs |

| Events | Personal events, historical events | Formation of continents, evolution of life |

| Perspective | Immediate, short-term | Long-term, vast |

| Understanding | Personal experience, history | Scientific study, geological evidence |

Why this difference is important:

* Understanding Earth's History: Geologic time helps us understand how Earth's continents formed, mountains rose, oceans changed, and life evolved over billions of years.

* Putting Human Impact in Perspective: Comparing human time with geologic time reveals how relatively brief our presence on Earth has been, but also how our actions can have long-lasting effects on the planet.

* Predicting Future Events: Understanding geologic time allows scientists to study past events and use that knowledge to predict future events, like volcanic eruptions, earthquakes, and climate change.

In short:

Human time is the scale we live in, while geologic time is the scale that defines our planet's history. They both provide crucial perspectives, allowing us to understand ourselves, our planet, and our place in the grand scheme of things.