The source of heating in the thermosphere is the absorption of ________
A) infrared rays from the Sun
B) infrared rays from the Earth
C) visible energy from the Sun
D) ultraviolet rays from the Sun
E) light rays reflected from the Earth
Answer: D
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Why do large regions of continental crust stand high above sea level?
A) ?The rigid asthenosphere allows the thicker continental crust to stand high above oceanic crust. B) ?Oceanic crust squeezes continental crust so that it continuously stands high above sea level. C) ?The continent's mountains float high above sea level because the lithosphere gradually sinks into the deformable asthenosphere until it has displaced a volume of asthenosphere equal to their mass. D) ?The uppermost mantle is thicker beneath continental crust than it is beneath oceanic crust allowing large regions of continental crust to stand high above sea level.
Which of the following elements is in the fourth period?
A. hydrogen (H) B. zirconium (Zr) C. chromium (Cr) D. carbon (C) E. beryllium (Be)
Crude death rates refer to the annual ratio of
A) deaths to every 1000 live births. B) deaths to every 1000 people. C) accidental deaths to deaths from natural causes. D) deaths from preventable diseases to deaths from natural causes. E) deaths to births.
Long before the Columbian exchange, Italy was known for its tomatoes, Ireland for its potatoes, and Thailand for its peppers
Indicate whether this statement is true or false.