examples:
Acadia National Park
a national park in Maine showing marine erosion and glaciation; includes seashore and also the highest point on the Atlantic coast
Arches National Park
a national park in Utah including mountains and the Colorado River gorge and huge rock formations caused by erosion
Badlands National Park
a national park in South Dakota having multicolored peaks and spires resulting from erosion; fossil sites
Canyonlands National Park
a national park in Utah having rock formations and ancient cliff dwellings; canyons of the Green River and the Colorado River
Carlsbad Caverns National Park
a national park in New Mexico featuring what is probably the world's largest cavern with spectacular underground formations
Crater Lake National Park
a national park in Oregon having the deepest lake in the United States in the crater of an extinct volcano
Denali National Park
a large national park in Alaska having peaks of the Alaska Range (including Mount McKinley) and the huge Denali fault
Everglades National Park
a national park in Florida containing an immense subtropical wilderness with mangrove swamps and rare birds and wild animals
Grand Canyon National Park
a national park in Arizona including the mile deep canyon of the Colorado River which shows geologic features and fossil plants and animals
Hot Springs National Park
a national park in Arkansas featuring ancient hot springs; bathing is said to have therapeutic effects
Kobuk Valley National Park
a national park in Alaska having mountains and forests and tundra and sand dunes and archeological sites
Mount Ranier National Park
a national park in Washington having mountain terrain featuring glaciers and alpine lakes and streams and swamps
Redwood National Park
a national park in California featuring a redwood forest and Pacific Ocean coastline
Yellowstone National Park
the first national park in the United States; located in the border area between Wyoming and Montana and Idaho; spectacular wilderness; famous for Old Faithful geyser and for buffalo and bears
Zion National Park
a national park in Utah having huge canyons and gorges carved by mountain rivers