Question

multiple choice question
which layer of earth is the source of magma that causes volcanoes?
crust
core
lithosphere
asthenosphere

Explanation:

The asthenosphere is a semi - molten layer in the upper mantle. Magma, which causes volcanoes, is generated in the asthenosphere due to its partially molten state. The lithosphere is rigid, the core is deep and mainly metallic, and the crust is the outermost solid layer.

Answer:

asthenosphere