Trap rock is a type of volcanic rock that is formed from the rapid cooling of lava. It is typically dark in color and has a fine-grained texture. This rock is commonly used in construction, particularly for making asphalt and concrete, due to its durability and strength. The term "trap rock" is derived from the Swedish word "trappa," meaning stairs, as the rock often forms steep cliffs and ledges. It is found in various regions, including the Northeastern United States and parts of Europe. Trap rock is also known for its resistance to weathering, making it a popular choice for landscaping and erosion control.