Sentences with phrase «significant volcanic activity»

Those «dramatic later events» have been revealed to be a stretch of significant volcanic activity between 40 and 50 million years ago.

(There was no significant volcanic activity.)

For instance, the warming that began in the early 20th century (1925 - 1944) is consistent with natural variability of the climate system (including a generalized lack of significant volcanic activity, which has a cooling effect), solar forcing, and initial forcing from greenhouse gases.