Geology

Earth Materials

• Minerals and Mining
• Petroleum
• Coral
• Fossils
• Petrified Wood

Weathered and Eroded Rocks

• Balanced Rocks
• Suspended Rocks
• Jointed Rocks
• Profiles in Rock
• Unusual Eroded Rocks
• Natural Bridges and Arches
• Rock Overhangs
• Badlands

Land Subsidence

Rivers and Surface Water

• Lakes
• Rivers
• Waterfalls
• Floods
• Canals and Locks
• Dams and Levees
• Irrigation

Underground Water

• Caves
• Springs and Geysers

Glaciers and Polar Regions

Sand Dunes

Earthquakes

Volcanoes and Volcanic Eruptions

Elevated Regions

• Buttes, Isolated Peaks, and Cliffs
• Mountain Ranges

Regions of Natural Beauty

• National Parks and Monuments
• Scenic Resorts
• Scenic Shorelines