Which of the following is most responsible for el nino?
a. usually cold water in the atlantic causes an increase in wind activity
b. calming down of trade winds in the pacific, which leads to the buildup of warm water
c. death of plankton and fish in northern hemispheres
d. disruption of the gulf stream

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed