A xenolith of sandstone was found incorporated into some of the erupted basaltic

Question

A xenolith of sandstone was found incorporated into some of the erupted basaltic lava, but the bedrock surrounding and directly underneath the volcano is limestone. What is the likely source of the sandstone xenolith?

A) crustal rock deep beneath the surface, adjacent to the magma chamber
B) mantle rock that partially melted during magma formation
C) lava that enveloped surface sandstone layers and long ago eroded away
D) sandstone pieces that fell into the volcano as it was erupting.

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What is the most likely explanation for the formation of Mole Hill volcano?

A) Meteorite impact fractured the crust, releasing magma.
B) A shallow magma chamber melted its way to the surface.
C) Ancient tectonic fractures reactivated, allowing deep magma to rise to the surface.
D) A subduction zone created a continental arc volcano.
E) Rifting caused crustal thinning and magma eruption.

Explanation / Answer

A xenolith of sandstone was found incorporated into some of the erupted basaltic lava, but the bedrock surrounding and directly underneath the volcano is limestone. (C) lava that enveloped surface sandstone layers and long ago eroded away is the likely source of the sandstone xenolith is the only one way to embedded the sanstone xenoliths in basalt.and rest of all may not possible to having this sanstone xenoliths.

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