Amy: Sometimes magma can find one of those fissures and rise up through it.
Roark: What's magma?
Rachel: Lava.
Roark: Lava? Right here in L.A?
Amy: It is one of the possibilities.
Roark: We have a history of that here in the downtown area?
Rachel: Paracutin... 1943, a Mexican farmer sees smoke coming out of the middle of his cornfield. A week later there's a volcano a thousand feet high. There's no history of anything until it happens. Then there is.