What does the appearance of red beds in the geologic record indicate about the atmosphere?
The atmosphere was oxidizing.
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How many semipermanent highs typically exist in the southern hemisphere in January?
A. 7 B. 5 C. 3 D. 2
How long is it estimated to take the ocean's volume of water to circulate through the oceanic crust at spreading centers?
A) 1 million years B) 10 million years C) 100 million years D) None of these choices
Which of the following is not an environment of metamorphism?
A) Contact with a hot magma body B) Hot fluids coming off a diaper C) Slow cooling of a magma D) High pressure in a subduction zone
Places on Earth that are both biologically rich and deeply threatened by human activities are known as __________ __________, which scientists believe deserve immediate attention for study and conservation
Fill in the blank(s) with correct word