The cold war was characterized by all of the following except

soviet control of countries and regions near its borders
tensions between organized religions and the communist party
repression of people who disagreed with the soviet government
a series of military battles between the united states and russia

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