Image courtesy of NASA
on the map above; this is easy to remember because "oriental" is the
The Sierra Madre Oriental is located at number
Spanish word for
A 2... west
B. 2... east
C. 3... west
D. 3... east

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