Using your atlas, turn to the pages featuring the polar regions and find the latitude/longitude coordinates for the:
a) Magnetic North Pole ___________________
b) Magnetic South Pole ___________________
a) 86.3°N 160.1°W
b) 64.3°S 136.6°E
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Which of the following statements about chain reactions is true?
A. The key requirement for a chain reaction is that more neutrons are produced than that are absorbed. B. Three or more neutrons must be released to sustain a chain reaction. C. Only uranium isotopes are capable of supporting a chain reaction. D. A chain reaction will only take place when a critical mass of material has been assembled. E. It is not possible to stop or control a chain reaction once it has been started.
A "weightless" astronaut in an orbiting space vehicle is
A. shielded from Earth's gravitational effects. B. without a support force. C. beyond the pull of gravity. D. all of the above
Which of the following is a consequence of clearing forests for agriculture purposes?
A) CO2 levels in the atmosphere drop to dangerously low levels. B) Water runoff decreases because crops will take up more of the moisture. C) Soil erosion increases because the tree roots and other vegetation that stabilize the soil have been removed. D) Biodiversity increases because of habitat diversification. E) The soil becomes richer and retains moisture better because there are few trees to take up the water and soil nutrients.
Geological processes, catastrophes, and climate change affect natural selection.
Answer the following statement true (T) or false (F)