After examining data showing changes in the amount of sunlight reaching Earth over time, the number of major volcanic eruptions, and many other possible causes for the increase in Earth’s global temperature, scientists have determined that is the most likely cause.

answermeridional ;

it was spontaneous.

"ain't i a woman? " is the name given to a speech, delivered extemporaneously, by sojourner truth, (1797–1883), born into slavery in new york state.sojourner truth' delivered her famous speech "ain't i a woman? " (which did not have a title at that moment) was given without any previous preparation. her dissertation took place at the women's convention in akron, ohio, in 1851.