Passage Summary: Scientists think that when heavy ice melted after the Ice Age, the earth's crust cracked because the weight was gone. Since Sweden had big earthquakes right when the ice was melting, the author concludes the melting probably caused the quakes.

Conclusion: The melting of ice at the end of the Ice Age likely played a role in causing the severe earthquakes that occurred in Sweden during that period.

Reasoning: Geological theory suggests that removing the weight of ice allows pressure from beneath the earth's crust to create cracks, and Sweden experienced both ice melting and earthquakes at the same time.

Analysis: The argument relies on a correlation between the timing of the ice melting and the occurrence of earthquakes in Sweden. To strengthen this, we need to bridge the gap between 'cracks appearing' and 'earthquakes happening' or show that the specific cracks in Sweden were indeed caused by the weight removal. Look for an answer choice that confirms the earthquakes were located in the specific areas where the ice-melt-induced crustal stress was highest.