One positive effect of devolution is that it helps maintain a cohesive state. This means that it helps the state remained unified.
Something must have been moving along and either plowed the stuff to one side or carried it and deposited it along the side. What else but a glacier?
PS. I'd guess this is more the province of geologists, not geographers
The best answer out of these four is letter C.
A type of magma which is a mix of basaltic and rhyolitic magma is called an andesitic magma. Andesite is called for the rocks from this magma. A strombolian eruption would most likely result to this type of magma. This type of eruption has a relative mild explosion having a volcanic explosivity index of approximately 2 to 3. The flow of lava for this type are more viscous thus thicker and shorter.
