Where on Earth? - July 2018

Where on Earth - July 2018

Clues for July 2018:

1. At times of low runoff (as in this picture), the river drains through a solution cavity in Paleozoic limestone. During times of high runoff, however, water fills the dry channel above the cavity, spilling over the cliff and creating a 30-meter-high waterfall.

2. The waterfall, located about 60 kilometers north of a colorfully named national park, was named after a nearby natural feature that collapsed in July 1988.

3. This river is the better known of two in the state with the same “rocky” name, and is a popular destination for hiking, camping and fishing.



Name the waterfall & its host state.


Scroll down for the answer


Answer: At times of low runoff, Natural Bridge Falls in Montana, which lies about 60 kilometers north of Yellowstone National Park, drains through a solution cavity in Paleozoic limestone. At times of high runoff, the Boulder River flows over a cliff producing a 30-meter-high waterfall. Photo by Jim Sukup.

July 2018 Winners:

Eric Asmussen (San Leandro, Calif.)
Leslie Bright (Kingsport, Tenn.)
R.J. Gauthier-Warinner (Interlochen, Mich.)
Robert Kasper (Abingdon, Md.)
Stephen Tomlin (Mount Evelyn, Victoria, Australia)



Visit the 'Where on Earth?' archive.

EARTH also welcomes your photos to consider for the contest. Learn more about submitting photos.


The American Geosciences Institute

AGI was founded in 1948, under a directive of the National Academy of Sciences, as a network of associations representing geoscientists with a diverse array of skills and knowledge of our planet.

Sunday, July 1, 2018 - 06:00