Within the layer labeled Area 2, rock is liquefied and heated. The arrows represent this liquid rock rising toward the outside of the layer where it cools and then sinks before
being heated again. What is the name given to this process?
A
tectonics
B.
convection
C.
condensation
D. metamorphosis

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