For the last 10,000 years as a whole, Earth temperatures can be said to be________
A) warm and fairly steady
B) unchanged
C) warmed drastically
D) cooled drastically
E) in an Ice Age
Answer: A
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Which of the following is (are) true for an evolutionary diagram?
A. Shows the progression of changes an area undergoes through time. B. May use block diagrams, cross sections, or maps. C. Uses a sequence of geologic diagrams to depict the geologic history of an area. D. All of these choices are correct.
What must be true of a rock unit that is cut by an igneous intrusion?
A. The rock unit is younger than the intrusion. B. The rock unit is the same age as the intrusion. C. The rock unit is older than the intrusion.
What was significant about African Humid Period?
A) Northern Africa was almost completely vegetated. B) The Sahara Desert was greatly expanded. C) Savanna landscapes were minimal. D) South Africa was heavily glaciated.
How can scientists learn about Earth's climatic history?
What will be an ideal response?