What is a geopark?
A geopark is a single area, with clear borders, where rocks and landforms are important to science, education or beauty. People still live and work there. It is not a place cut off from people.
A special spot inside it, like a cliff, a cave or a lava column, is a geosite. A geopark joins many geosites with roads, signs, museums and guides. The word geoheritage means rocks and landforms that we want to keep for the future, like old buildings.
What can a landscape teach us?
Rock layers. Mud and sand settle one on another over thousands of years. Later they press into stone. The oldest layer is at the bottom. Fossils inside tell what lived then.
Volcanic landforms. Lava builds cones and flows. When it cools fast, it makes fine-grained rock called basalt. A crater can fill with rain and make a crater lake.
Columns. Thick lava cools and shrinks. It cracks into six-sided columns, like dried mud cracks but taller. Famous places are Jusangjeolli on Jeju, the Hantangang river valley in Korea and the Giant's Causeway in Northern Ireland.
Craters from space. The Lonar lake in India sits in a bowl made when a space rock hit hard basalt.
The three jobs of a geopark
- Protect: keep the rocks and landforms safe. No taking rocks, no damage.
- Learn: schools, museums, trails and signs that explain how the place formed.
- Help local people: guides, homestays, food and crafts give income, so people want to protect the place.
This third job is what makes a geopark different from a strict nature reserve.
Korea's geoparks and the UNESCO label
UNESCO gives the title UNESCO Global Geopark to places that meet high standards and are checked again every few years. Korea has several, for example Jeju Island (volcanic island, crater lake at Hallasan, lava cliffs), Cheongsong (layered rocks and old volcanic rocks), Mudeungsan (tall rock columns on a mountain) and Hantangang River (a gorge cut through basalt, with waterfalls and columns).
Korea also keeps national geoparks. Many countries do the same. Other examples are in Asia, Europe and Africa; each tells its own story of rock.
Try it
In the 3D: tap each site. Which one tells about the oldest time? Which one shows fast cooling of lava?
At home: next time you see a road cutting, a quarry or a river bank, look for layers. Sketch them and mark which one is the oldest. Find a place near you where visitors could learn the story of the rocks, and say who could be the guide.
Key formulas and definitions
- Key words: geopark = area of important rocks and landforms managed for protect, learn, people
- Geosite = one special place inside a geopark; geoheritage = rocks and landforms worth keeping
- Layers: oldest at the bottom, youngest at the top (if not folded). Thickness = layers × thickness of each
- Time for a layer = thickness ÷ speed of settling
Worked examples
1. A sea cliff in a geopark shows 6 layers, each 40 cm thick. How tall is the layered part?
6 × 40 cm = 240 cm = 2.4 m. The bottom layer is the oldest.
2. Mud settles at about 2 mm per year. How long to build a 1 m layer?
1 m = 1000 mm. Time = 1000 / 2 = 500 years.
3. Name the three jobs of a geopark and give one local example for each.
Protect: no rock collecting at Jusangjeolli cliff. Learn: a museum or trail sign explaining the lava columns. Help local people: villagers working as guides or selling local food.
Common mistakes
- Thinking a geopark is only a park for animals and trees. Its main subject is rocks and landforms.
- Thinking nobody lives in a geopark. People live and earn there; this is one of its aims.
- Mixing up geosite and geopark. A geosite is one spot; the geopark is the whole area with many geosites.
- Reading layers upside down. The oldest layer is usually at the bottom.