Midway Geyser Basin
Students from the University of Wisconsin-Whitewater pause at Grand Prismatic Spring in the Midway Geyser Basin in Yellowstone National Park.
With the help of fellow student and roommate Loryn Zachariasen, right, University of Wisconsin-Whitewater student Brittany Saylor reads from her field journal at Midway Geyser Basin in Yellowstone National Park.
Megan Lynch, a biology major at the University of Wisconsin-Whitewater, passes the Opal Pool in the Midway Geyser Basin ahead of her college peers.
From left, Brittany Saylor, Casey Stark and Megan Lynch from the University of Wisconsin-Whitewater spent Thursday in Yellowstone National Park as part of a college course on the park's thermal features.
Casey Stark, a biology student at the University of Wisconsin-Whitewater, tours the Midway Geyser Basin at Yellowstone National Park as part of a class on the park's thermal features.
YELLOWSTONE NATIONAL PARK, Wyo. — The humidity jumped to tropical levels when the wind shifted and the steam from Excelsior Geyser washed over the boardwalk.
This geyser basin, though small in size compared to its companions along the Firehole River, holds large wonders for the visitor. Excelsior Geyser reveals a gaping crater 200 x 300 feet with a constant discharge of more than 4,000 gallons of water per minute into the Firehole River. Also in …
Steam from Midway Geyser Basin rises around bison crossing a footbridge in Yellowstone National Park. The park’s thermal features are home to unique microbes.
Ignoring the signs that instruct visitors to stay on the boardwalks, these tourists encourage each other to do what it takes to get the photo. The group was at Midway Geyser Basin in Yellowstone National Park. For the first time, visitation to the park topped 3 million in the first nine mont…