Here's why:
* Andesitic magma is a type of magma that is intermediate in composition between basaltic (mafic) and rhyolitic (felsic) magma. It is characterized by a higher silica content than basaltic magma, but lower than rhyolitic magma.
* Mount Bromo's eruptions have a history of producing volcanic ash, which is a hallmark of andesitic eruptions.
While Mount Bromo is known for producing andesitic magma, it's important to note that the specific composition of magma can vary slightly within a volcanic system, and over time.
