Estuaries are categorized by ____
A) location or latitude
B) circulation patterns
C) the ratio of fresh water to salt water
D) sediment origins and age
B
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Plants became extinct at twice the rate of animals during the Permian extinction event
a. True b. False
Earth systems resist change but there are times when the system can change abruptly or become unstable. This is known as a ________
A) human mistake B) negative feedback loop C) equilibrium condition D) tipping point E) quantum moment
The average polarity interval between magnetic reversals over the last 15 million years has been
A) 20,000 years. B) 200,000 years. C) 2,000,000 years. D) 2,000 years.
What have been some of the causes of the increased amount of oil found in the ocean? What is the
largest source of additional oil? What will be an ideal response?