Faye Cook, age 13, of Whi a House, Tenn., or her question:

Which is the largest National Park?

Over a million acres of the scenic Everglades of Florida are set aside as a National Park. Almost a million acres of northwestern Montana comprise Glacier National Park. Sixty glaciers nestle among its jagged mountains. Mt. McKinley in central Alaska, highest peak in North America, stands within a National Park covering almost two million acres.

But larger by far than any of these great beauties is Yellowstone. The vast tract of natural wonders was also the first to be set aside for preservation. It covers an area of 2,213,207 acres, sprawling over the northwestern corner of Wyoming into parts of Montana.

In Yellowstone there are pools of boiling mud, hot springs and steamy streams, petrified forests, waterfalls and crystal lakes. And, of course, there is Old Faithful and a whole tribe of lesser geysers. It is about 60 miles long and 60 miles wide. You can travel 900 miles of trails and see most of its wonders. Still, much of it is left unraveled wilderness.