Encore - Iguassu Waterfalls

June 11, 2016

EPOD_Encore Iguassu falls
Today, and every Saturday Earth Science Picture of the Day invites you to rediscover favorites from the past. Saturday posts feature an EPOD that was chosen by viewers like you in our monthly Viewers' Choice polls. Join us as we look back at these intriguing and captivating images.

Mike Passow
Summary Author: Mike Passow; Jim Foster

The photo above shows a close-up view of the impressive Iguassu Falls on the border of Brazil and Argentina. These amazing falls occur where the Iguassu River, approximately two miles (3 km) wide at the point of the falls, plunge over basalt cliffs, some of which are 260 feet (80 m) high. The basalt cap rocks formed over 100 million years ago. Iguassu Falls is the thought to be one of the widest falls in the world. Actually, hundreds of separate cataracts spread across the Iguassu River. Spotting a rainbow in the vicinity of a waterfall is easy work when the weather is sunny -- just make sure your back is to the Sun. Note also the faint secondary bow. Photo taken on August 11, 2010.

Photo Details: Camera Maker: OLYMPUS IMAGING CORP; Camera Model: uT6000,ST6000; Focal Length: 5.0mm (35mm equivalent: 28mm); Aperture: f/5.0; Exposure Time: 0.0063 s (1/160); ISO equiv: 50; Exposure Bias: none; Metering Mode: Matrix; Exposure: Creative Program (based towards depth of field); White Balance: Auto; Flash Fired: No; Color Space: sRGB.