Describe and discuss the formation of the Proterozoic Banded Iron Formations (BIFs). What are
they composed of? Why are these BIFs economically important? What will be an ideal response?
BIFs are composed of the iron oxide minerals hematite and magnetite interbedded with layers of
chert. The increasing oxygen contained in Earth’s atmosphere caused precipitation of these iron
oxides from seawater. BIFs are important sources of iron for industrial purposes.
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Most meteors seen as shooting stars are about the size of
A. very large buildings. B. small continents. C. grains of sand. D. small buildings. E. baseballs.
Outline the many different experimental samplings conducted during the Challenger expedition. What will be an ideal response?
Earth is closest to the sun in ____
A) January B) March C) July D) September
Which is not true of geographers?
A) They are Earth systems scientists. B) They are primarily concerned with place names. C) They are concerned with spatial and temporal relationships. D) They use spatial analysis.