What material makes up the flanks of cinder cones? Why does magma rising through the conduit of a cinder cone volcano often break through the side of the volcano and flow down the flank?

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The Answer of What material makes up the flanks of cinder cones? Why does magma rising through the conduit of a cinder cone volcano often break through the side of the volcano and flow down the flank?

What Material Makes Up the Flanks of Cinder Cones? Why