earth's size and composition led to volcanic activity, which in turn, had a major impact on earth's _

  Earth's size and composition led to volcanic activity, which in turn, had a major impact on Earth's geographical relief

Explanation:

Magmatic material expelled to the surface is responsible for the formation of volcanic relief. Materials from within the earth can be found in three states: solid, liquid and gaseous. Importantly, volcanism, together with tectonism and earthquake, comprise internal relief shaping agents.

The phenomenon in question most often happens in places where tectonic plates meet. The magmatic material comes to the lava-shaped surface, it covers large area around. Volcanism as a relief shaping agent is responsible for the rise of mountains and plateaus. In the formation of mountains, all the lava that is emitted is stored near where all the magmatic material comes out. Thus, after various processes of this nature, the mountain is constituted.

the only other powers were germany russia and uk and they were too busy fighting each other wearing each other down   that the us was becoming strong and they were becoming weaker

it sounds like either a or c