Which of the following is NOT a source of material for soil?
A. CO2 gas from roots
B. leaves and other plant debris
C. weathered rock and sediment
D. water from precipitation and snowmelt
E. All of these are a source of material in soil.
Answer: E
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Which of the following is a measuring device that is used in order to produce a sounding?
A. radiosonde B. barograph C. psychrometre D. thermometre
A species becomes extinct when
A. individuals of two different species try to mate. B. all individuals of a species are eliminated. C. habitat change causes organisms to leave an area. D. All of the statements are correct.
Kilauea's volcanic activity has occurred along the flanks of the volcano in a region called the ________, which has erupted continuously since 1983
A) East Rift Zone B) West Rift Zone C) North Rift Zone D) South Rift Zone
The reason that Earth is now closest to the Sun in January, but will be closest in July in 11,000 years,
is: a. orbital eccentricity. b. changes in axial tilt. c. precession of the equinoxes. d. gravitational attraction to the sun. e. gravitational attraction to the moon.