Earth's terrestrial ecosystems can be categorized into one of four basic types: ____

a. forest, grassland, desert, and highlands
b. forest, grassland, desert, and tundra
c. forest, shrub, grassland, and tundra
d. rain forest, coniferous forest, grassland, and desert
e. rain forest, shrub, grassland, and desert


b

Environmental & Atmospheric Sciences

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Which one of the following materials is a mineral?

a) Snowflakes b) Brick c) Gasoline d) Acorn (this is the seed of an oak tree) e) Chocolate

Environmental & Atmospheric Sciences

Giving probabilities of a "White Christmas" is an example of a(n) ____ forecast

A) climatology B) persistence C) ensemble D) analog E) numerical

Environmental & Atmospheric Sciences

Wind-driven surface currents move at a speed that is ________ the average driving wind speed.

A. one one-hundredth B. one tenth C. the same as D. twice E. None of these is correct; there is no relationship.

Environmental & Atmospheric Sciences

The "silent giant" that feeds most of the world's poor is inefficient because it relies upon

A) subsistence farming best suited for low population densities in regions with the fastest population growth. B) subsistence farming best suited for high population densities in regions with the slowest population growth. C) agricultural practices that require the heavy use of fertilizers and pesticides that degrade the environment. D) individuals walking over large regions to collect wild fruits, nuts, berries, and wood for fuel.

Environmental & Atmospheric Sciences