Which of the following has been cited as a positive feedback loop involving the thawing of permafrost?
A) Thawing of permafrost will release vast amounts of carbon to the atmosphere, accelerating warming.
B) Thawing of permafrost will increase albedo, leading to more warming.
C) Thawing of permafrost will contribute to sea level rise, which will further reduce overall global albedo values.
D) Thawing of permafrost will inhibit frost wedging action on large boulders, altering absorption ability.
A
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The radioactive element Unobtanium-189 (Ut-189) decays to the stable element Dilithium-171 (Di-171). The half-life of Ut-189 is 10 million years. Using a very sensitive atom-counter instrument, you determine that a mineral sample has 150 atoms of Di-171, and 50 atoms of Ut-189. Assume that no atoms have been lost due to metamorphism over the lifetime of the rock.Use this information to answer the following question.What is the age of the mineral?
A. 10 million years old B. 20 million years old C. 30 million years old D. 40 million years old
What is a drainage divide?
A. The area where a stream flows into a lake or ocean. B. A ridge or strip of high ground separating one drainage basin from another. C. The arrangement of a stream and its tributaries. D. The total area drained by a stream and its tributaries.
The intense rain of India's monsoon season is attributed to:
A) the arrival of the subtropical high. B) increased moisture advection from the north. C) the northward migration of the ITCZ. D) the cooler winter temperatures, which make it easier for water vapor to condense.
What was the Cold War?
a. the stalemate between Japan and Russia over control of the Kuril Islands b. the Soviet's withholding of oil and natural gas exports during the winter of 1953 c. a geopolitical struggle between the Soviets and the West for allegiance of newly independent countries in the aftermath of WWII d. a long-standing skirmishes among the different ethnic groups in Siberia e. Napoleon's invasion of Russia during the winter