• Science
• B1

Mapping the Volcanic History of Long Valley

The United States Geological Survey studies volcanoes in the Long Valley area of California. Scientists have made a geologic map to show different types of rocks and soil. Modern mapping techniques include analyzing the chemical composition of rocks. They also measure the age of lava flows to understand past eruptions.

Rewritten with AI from facts reported by USGS. Read the original for the full report.