Big Crack
E915306
Big Crack is a prominent underwater section of Iceland’s Silfra fissure, where divers can swim between the tectonic plates of North America and Eurasia.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Big Crack canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11281764 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Big Crack Context triple: [Silfra fissure, hasSection, Big Crack]
-
A.
Crack-in-the-Ground
Crack-in-the-Ground is a volcanic fissure and hiking destination in Oregon’s high desert, known for its deep, narrow rock crevices and striking geological formations.
-
B.
Wolfberg Cracks
Wolfberg Cracks are a famous series of dramatic sandstone fissures and passageways popular with hikers and climbers in South Africa’s Cederberg mountains.
-
C.
Main Crater
Main Crater is the principal volcanic crater of Costa Rica’s Irazú Volcano, known for its steep walls and often vividly colored crater lake.
-
D.
Crack Canyon
Crack Canyon is a narrow, scenic slot canyon popular with hikers and canyoneers in the San Rafael Swell region of central Utah.
-
E.
Imperial Fault
Imperial Fault is a major right-lateral strike-slip fault in Southern California that forms part of the tectonically active plate boundary system linking the San Andreas Fault to the Gulf of California.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Big Crack Target entity description: Big Crack is a prominent underwater section of Iceland’s Silfra fissure, where divers can swim between the tectonic plates of North America and Eurasia.
-
A.
Crack-in-the-Ground
Crack-in-the-Ground is a volcanic fissure and hiking destination in Oregon’s high desert, known for its deep, narrow rock crevices and striking geological formations.
-
B.
Wolfberg Cracks
Wolfberg Cracks are a famous series of dramatic sandstone fissures and passageways popular with hikers and climbers in South Africa’s Cederberg mountains.
-
C.
Main Crater
Main Crater is the principal volcanic crater of Costa Rica’s Irazú Volcano, known for its steep walls and often vividly colored crater lake.
-
D.
Crack Canyon
Crack Canyon is a narrow, scenic slot canyon popular with hikers and canyoneers in the San Rafael Swell region of central Utah.
-
E.
Imperial Fault
Imperial Fault is a major right-lateral strike-slip fault in Southern California that forms part of the tectonically active plate boundary system linking the San Andreas Fault to the Gulf of California.
- F. None of above. chosen
Statements (34)
| Predicate | Object |
|---|---|
| instanceOf |
dive site
ⓘ
underwater fissure section ⓘ |
| accessRequirement | guided dive or snorkel tours ⓘ |
| betweenTectonicPlates |
Eurasian Plate
NERFINISHED
ⓘ
North American Plate NERFINISHED ⓘ |
| connectedTo |
Silfra Cathedral
NERFINISHED
ⓘ
Silfra Hall NERFINISHED ⓘ Silfra Lagoon NERFINISHED ⓘ |
| continent | Europe ⓘ |
| country | Iceland ⓘ |
| environmentType | subarctic freshwater environment ⓘ |
| geologicalFeature | submerged rift valley section ⓘ |
| geologicalOrigin | rift between tectonic plates ⓘ |
| locatedIn |
Iceland
NERFINISHED
ⓘ
Silfra fissure NERFINISHED ⓘ Þingvellir National Park NERFINISHED ⓘ |
| locatedInBodyOfWater | Þingvallavatn NERFINISHED ⓘ |
| notableFor |
allowing divers to swim between tectonic plates
ⓘ
clear, filtered glacial water ⓘ |
| partOf | Silfra fissure NERFINISHED ⓘ |
| partOfUNESCOWorldHeritageSite | Þingvellir National Park NERFINISHED ⓘ |
| protectedArea | Þingvellir National Park NERFINISHED ⓘ |
| safetyRequirement |
cold-water diving equipment
ⓘ
dry suit for scuba diving ⓘ |
| tectonicSetting | boundary between North American Plate and Eurasian Plate ⓘ |
| tourismType |
adventure tourism
ⓘ
dive tourism ⓘ |
| usedFor |
scuba diving
ⓘ
snorkeling ⓘ |
| visibility | up to about 100 meters ⓘ |
| waterClarity | high visibility ⓘ |
| waterSource | glacial meltwater from Langjökull glacier ⓘ |
| waterTemperature | approximately 2–4 °C year-round ⓘ |
| waterType | freshwater ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Big Crack Description of subject: Big Crack is a prominent underwater section of Iceland’s Silfra fissure, where divers can swim between the tectonic plates of North America and Eurasia.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.