Question

the breadknife is a rock formation in australia. it is almost 300 feet high and 13 feet wide. the formation is shaped like a long, narrow knife. the breadknife is made of trachyte. it formed when melted rock was forced through a crack in the earths surface. the formation was once surrounded by other rocks. these rocks have since been eroded, leaving behind a long, thin column of trachyte. what type of rock is the breadknife made of? igneous metamorphic

Explanation:

文中提到The Breadknife由粗面岩（trachyte）构成，且是由熔融岩石从地球表面的裂缝中挤出形成，这符合火成岩（igneous rock）的形成特征，火成岩是由岩浆或熔岩冷却凝固形成的。

Answer:

igneous