A group photo at the Pfizer talc mine, Warm Springs, southern Death Valley, May 1.

The group explores Mosaic Canyon, near Stovepipe Wells, central Death Valley, May 1

Annie Holmes studies the cratered landscape of the Ubehebe volcanic field, northern Death Valley, May 2.

A young rattlesnake on the grassy slopes near SP Crater, San Francisco volcanic field, northern Arizona. Note the extended tongue and the blurred tail.

The 2006 UTC SP assault team on the rim of SP Crater, May 3.

Students "glissade" in loose tephra down the side of SP Crater.

Part of the group enjoys a warm fire on Boulder Mountain, near Capitol Reef National Park in south-central Utah, May 5.

Yours truly at the overlook of Cathedral Valley, Capitol Reef National Park, May 6.

Annie emerges from her tent on a brisk morning in the San Rafael Swell, central Utah, May 7.

Students view Checkerboard Mesa in Zion National Park, May 8.