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Crucigrama Sopa de Letras Hoja de Trabajo
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6th Mass Extinction?

Horizontales
Large meteor impact
Global cooling followed by global warming
Siberian Volcanism
Small number of species, longer period of time
Interpreted fossil
Verticales
Species on verge of extinction
Lower global diversity
Alternating glacial events
Negatively impact other species
Increased carbon dioxide levels in atmosphere