Lake Mead near Hoover Dam

Vertical

View of Lake Mead in the vicinity of Hoover Dam (mostly hidden, far left): A fall in water level is revealed by the white “bathtub ring,” where the surface layers of previously inundated sandstone have been altered by the action of cyanobacteria, or blue-green algae.

NPS Photo by Susann a Pershern, Submerged Resources Center

Horizontal

View of Lake Mead in the vicinity of Hoover Dam (mostly hidden, far left): A fall in water level is revealed by the white “bathtub ring,” where the surface layers of previously inundated sandstone have been altered by the action of cyanobacteria, or blue-green algae.

NPS Photo by Susann a Pershern, Submerged Resources Center

Thumb

View of Lake Mead in the vicinity of Hoover Dam (mostly hidden, far left): A fall in water level is revealed by the white “bathtub ring,” where the surface layers of previously inundated sandstone have been altered by the action of cyanobacteria, or blue-green algae.

NPS Photo by Susann a Pershern, Submerged Resources Center
view counter
view counter

Recent Stories

The importance of food, jealousy, and paternal care in the evolution of owl monkey monogamy

La importancia del alimento, los celos y el cuidado paternal en la evolución de la monogamia en el mono mirikiná

Comparing the rewards of small-scale farming to those recounted by Thoreau

Conspicuous armaments are good visual proxies for fighting ability.