Worldwide, traditional, and native varieties of food crops have ________ since the introduction of green revolution varieties.

A. Spread from region to region, leading to increased diversity
B. Been widely replaced by new varieties
C. Been slightly influenced by new varieties
D. Become more widespread
E. Stayed about the same in terms of use


Answer: B

Environmental & Atmospheric Sciences

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Drumlins look like __________ and they occur __________.

A) mesas; in isolation B) mesas; in swarms C) inverted spoons; in isolation D) inverted spoons; in swarms E) roches moutonnées; in isolation

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An isoline is a(n)

A) imaginary line connecting all points along the same longitude. B) indicator on a map of the map scale. C) imaginary line connecting all points along the same latitude. D) a line on a map connecting points with a constant value. E) arc crossing all meridians of longitude at the same angle

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How much colder were average temperatures during glacial periods?

A. 5-10 degrees C B. 10-12 degrees C C. 1-2 degrees C D. 3-5 degrees C

Environmental & Atmospheric Sciences