Explain how paleoclimatologists can determine past temperatures through tree rings
What will be an ideal response?
Answer: Tree rings serve as a proxy through which the conditions present at the time of growth can be observed. A small cylinder of the tree is removed and the rings examined. The size of each ring gives clues about the conditions at that particular year.
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The reason a fired cannonball maintains its horizontal component of velocity, barring air resistance, is that
A. the absence of a vertical component of velocity. B. no forces act on it. C. no horizontal forces act on it. D. all of the above
Just after the body dies, it immediately stops taking in needed oxygen. Does it at the same time immediately stop producing carbon dioxide?
A) Yes, because without the oxygen, carbon dioxide can no longer be produced. B) Yes, because death means an immediate cessation of all body metabolism. C) No, and without CO2 exhalation the pH of the blood decreases to very damaging levels. D) No, and without CO2 exhalation the pH of the blood increases to very damaging levels.
Mongolia's large lakes are found in the:
A) northwest B) northeast C) southwest D) southeast
Match each city with its former name.
A) Calcutta B) Bombay C) Madras 72) Mumbai 73) Kolkata 74) Chennai