Which type of rock is formed through cooled magma or lava?

Igneous rock

Which Greek hero was invulnerable except for his heel? Who was the loyal wife who waited twenty years for Odysseus's return? In which sport is the term 'love' commonly used? What did the Triangle Shirtwaist Factory fire of 1911 highlight in U.S. labor history? What's the term for a circle's distance from the center to its edge?