Fire Islands is an Atlantic Ocean barrier island off the southern shore of Long Island, New York. Photo: Jennifer Miselis, USGS. Public domain.

Barrier Islands in the United States

Caitlin Dempsey

Barrier islands are narrow stretches of land that run parallel to coastlines.

Mount Logan is the highest in mountain in Canada at 5,959 meters (19,551 feet)

What is a Mountain?

Caitlin Dempsey

While it is widely assumed that a mountain is higher than a hill, there is no universally accepted definition of a mountain.

Satellite imagery of the northwestern side of La Malinche volcano, Mexico. Image: NASA, public domain

What are Barrancas?

Caitlin Dempsey

One place to find barrancas is at the lower elevations of La Malinche volcano in central Mexico.

An 1860 lithographic print by Eugene von Guerard entitled Crater of Mount Eccles (Victoria). Public domain via MediaWiki Commons.

Linking Geological Events to Aboriginal Oral Tradition and Stories

Katarina Samurović

Recent findings about the existence of human civilization dating back 50,000 years suggests major geological events have been described in Aboriginal oral tradition and stories.

Subaerial portion of Pūhāhonu. Photo: NOAA, public domain.

Earth’s Largest Shield Volcano

Caitlin Dempsey

Scientists have discovered the Earth's largest volcano using bathymetric and gravity mapping.