What is the name of the volcanic rock, often reddish or black, used extensively for grinding tools, building blocks and garden walls across the highlands since pre-Hispanic times?

• A Basalto
• B Cantera
• C Pedernal
• D Tezontle ✓

Tezontle is a lightweight, porous volcanic stone that has been quarried since Aztec times and is a hallmark of colonial-era architecture.