user: Question: What is the composition at Valles lava dome?
Columns: ['Name of lava dome', 'Country', 'Volcanic area', 'Composition', 'Last eruption or growth episode']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Chaitén lava dome', 'Chile', 'Southern Volcanic Zone', 'Rhyolite', '2009']
SQL:

assistant: SELECT "Composition" FROM "Table" WHERE "Name of lava dome" = 'Valles lava dome';