In the Milankovitch model, what is the cause of Earth's Ice Ages?
A. Sunspot activity
B. Cyclic changes in solar heating
C. Plate tectonic activity
D. Changes in ocean circulation
Answer: B
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Which sub-region of Russia has the mildest climate?
a. Caucasus b. Slavic c. Siberian d. Baltic
Which of the following best describes what happened to the dinosaurs about 65 million years ago?
A. A large asteroid impact resulted in global climatic change and the death of the dinosaurs. B. More intelligent mammals began to evolve and competed for limited food resources, ultimately causing dinosaurs to go extinct C. A massive volcanic eruption resulted in global cooling, which killed the dinosaurs. D. The extinction of the dinosaurs 65 million years ago remains a great mystery to scientists. E. A large solar flare quickly raised Earth's temperature to the point where dinosaurs couldn't survive.