Question

according to the text, where did the lava flow from to make the bedrock of eastern washington?
según el texto, ¿de dónde fluyó la lava para formar la roca madre del este de washington?

○ earths middle layer (capa media de la tierra)
○ volcanic mountains (montañas volcánicas)
○ carried by the missoula floods (llevado por las inundaciones de missoula)
● deep cracks in the earths crust (grietas profundas en la corteza terrestre)

Explanation:

Lava that forms bedrock often emerges from deep - seated sources in the crust. Deep cracks in the earth's crust can act as pathways for lava to reach the surface and solidify into bedrock. Volcanic mountains are a result of lava eruptions rather than the source in this context, and the Missoula floods are not related to lava flow for bedrock formation. The earth's middle layer is not the direct source as described in the options for this specific case.

Answer:

deep cracks in the earth's crust (grietas profundas en la corteza terrestre)