Sharp eroded coral rock makes a treacherous path down to an eroded wave-cut terrace on the Guam coastline.

Waves crashing against the Guam shoreline.

Sea, foam, sky, and coral rock meet on the Guam coastline.

Tumon Bay resort area on the Guam coastline.

Uncovered reef flat at low tide on the Guam coastline.

Uncovered reef flat with intervening channels at low tide on the Guam coastline.

Uncovered reef flat with intervening channels at low tide on the Guam coastline.

Uncovered reef flat with intervening channels at low tide on the Guam coastline.

Uncovered reef flat with intervening channels at low tide on the Guam coastline.

Uncovered reef flat with intervening channels at low tide on the Guam coastline.

Uncovered reef flat with intervening channels at low tide on the Guam coastline.

Uncovered reef flat with area of brown algae at low tide on the Guam coastline.

Brown algae in channels while reef flat appears devoid of growth at low tide on Guam coastline.

A series of wave-cut terraces in the coral rock of the Guam coastline.

A rainbow graces the jungle foliage of the Guam mountains.

Mangroves growing in the coral rocks of the Guam coastline.

Mangroves growing in the coral rocks of the Guam coastline.

Mangroves growing in the coral rocks of the Guam coastline.

Phragmites marshland in wetlands of Guam.

Phragmites marshland in wetlands of Guam.

Phragmites marshland in wetlands of Guam.

Inajaran Falls in the interior of Guam.

Inajaran Falls in the interior of Guam.

Inajaran Falls in the interior of Guam.

Pago Bay panorama, Guam coastline.

Talofofo Bay mosaic, Guam coastline.

Tumon Bay mosaic, Guam coastline.

A fall scene along the Inside Passage.

A scene along the Inside Passage.

Salmon fishing along the Inside Passage.

Islands and mountains along the Alaska Peninsula.

A scene along the Alaska Peninula.

A scene along the Alaska Peninsula.

A scene along the Alaska Peninsula.

A scene along the Alaska Peninsula.

A scene along the Alaska Peninsula.

A scene along the Alaska Peninsula.

A small island off the Alaska Peninsula.

Shishaldin Volcano, one of the great navigational landmarks of Alaska.

Shishaldin Volcano, one of the great navigational landmarks of Alaska.

Shishaldin Volcano, one of the great navigational landmarks of Alaska.

Isanotski Volcano on Unimak Island, also called Ragged Jack because of its prominent horns.

Night-time cruising in the Aleutian Islands. Moon beams reflecting off the water as mountains are barely perceptible in the

The Boston skyline as seen from the bridge of the NOAA Ship WHITING.

A scene along the Inside Passage seen from the NOAA Ship RAINIER.

A magnificent view of the Point Bonita Lighthouse with the Golden Gate Bridge in the background.

The Point Bonita Lighthouse at the northern entrance to the Golden Gate.

Anchor Glacier

Cook Inlet sunset

A stormy day on the Gulf of Alaska