What most likely happened in sediment layer 5? A massive volcano erupted, causing global warming and lava flow, which in turn caused mass extinction. More iridium was produced by space objects and dumped

What most likely happened in sediment layer 5?

A massive volcano erupted, causing global warming and lava flow, which in turn caused mass extinction.
More iridium was produced by space objects and dumped by local factories.
A massive dust cloud formed, causing global cooling and a lack of sunshine. This in turn caused a lack of plants and a mass extinction.
Fewer impacts lead to a drop in iridium levels and a mass extinction caused by a lack of sunshine.

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What most likely happened in sediment layer 5? A massive volcano erupted, causing global warming and lava flow, which in turn caused mass extinction. More iridium was produced b…

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