BCC / LEARNING LAB 104
Seven primary references, checked 2 October 2026. Published facts are kept separate from arithmetic and invented teaching objects. These pages do not supply live conditions, surveyed landmark heights or failure predictions.
Evidence key: reference = a published quantity; derived = arithmetic from a stated input; illustrative = original explanatory drawing. This pack includes no new measured field asset.
sc-nps-road · REFERENCE
National Park Service · checked 2 October 2026 · source update: 2025-08-06
Main park road: 18 miles (29 km), entrance to road end. Use the full main road, not only the 15-mile southern section.
Limits. Published approximate route length, not a surveyed straight-line distance or a current road-status report.
Reuse. Numerical facts paraphrased; no page photograph or artwork reproduced.
sc-nps-rim · REFERENCE
National Park Service · checked 2 October 2026 · source update: 2024-10-11
The Sunset–Sunrise section of Rim Trail is 0.5 mile (0.8 km) one way.
Limits. Published approximate distance. The exercise adds an equal return leg; it provides no conditions, access or travel-time advice.
Reuse. Numerical facts paraphrased; no map, photograph or artwork reproduced.
sc-nps-palette · REFERENCE
National Park Service · checked 2 October 2026 · source update: 2024-01-08
Introductory Claron deposition interval: 50–60 million years ago. Sunset Point wayside describes exposure at 8,000 feet (2,438 m).
Limits. An interpretive formation-age range, not a statistical confidence interval or the age of any hoodoo. The 8,000-foot value is rounded; the elevation comparison is approximate.
Reuse. Facts paraphrased; the wayside image and its composition are not copied.
sc-nps-rainbow · REFERENCE
National Park Service · checked 2 October 2026 · source update: 2026-08-15
Published viewpoint elevation: 9,115 feet (2,778 m).
Limits. Elevation above sea level is not the height of a rock or cumulative trail ascent. No vertical datum or survey uncertainty is supplied by this interpretive page.
Reuse. Numerical facts paraphrased; no photograph reproduced.
sc-nps-ice · REFERENCE
National Park Service · checked 2 October 2026 · source update: 2021-09-04
NPS describes water expanding by about 9 percent in volume when freezing, in its ice-wedging explanation.
Limits. A teaching approximation. The free-expansion cup/cube exercises do not predict rock pressure, crack displacement, constrained freezing or a laboratory outcome.
Reuse. Physical explanation paraphrased; no image, diagram or map reproduced.
sc-nps-erosion · REFERENCE
National Park Service · checked 2 October 2026 · source update: 2018-10-16
The NPS interpretive erosion estimate is 2–4 feet per 100 years.
Limits. Broad interpretive average range, not a probability distribution, constant local rate, height-loss rate for every hoodoo, or failure forecast.
Reuse. The numeric range is paraphrased; no photo sequence is reproduced.
sc-nist-length · REFERENCE
National Institute of Standards and Technology · checked 2 October 2026 · source update: not recorded
International foot = 0.3048 m exactly; international mile = 1,609.344 m exactly.
Limits. Exact conversion factors do not increase the precision of an approximate input. These exercises use international feet and miles, not legacy survey-foot coordinates.
Reuse. Conversion facts paraphrased; no table image reproduced.
All twelve SVG drawings, worksheet layouts, explanatory text and code were created for this BCC pack. No third-party photograph, map, logo, font file or diagram is reproduced. System fonts are used. Primary-source facts are linked and paraphrased; no NPS affiliation or endorsement is implied.
The answer checker accepts a number that rounds to the target at the requested step. Extra decimals, well-formed thousands separators, scientific notation and simple fractions are accepted. Units are shown beside fields; enter numbers only. For a range, enter both endpoints in increasing order. This rule is educational tolerance, not measurement uncertainty.