Composite volcanoes erupt explosively. What kind of magma do you conclude that composite volcanoes must contain?

A) magma that is mostly liquid
B) thick, sticky magma rich in solids and gas
C) ancient magma
D) magma made of cement


B

Environmental & Atmospheric Sciences

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Relative to ultraviolet waves, the frequency of infrared waves is

A. about the same. B. higher. C. less. D. not enough information

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Pastoralism

A) requires elaborate fencing networks and patterns to manage herds. B) is most commonly practiced in drier climates unsuitable for subsistence agriculture. C) is increasing in important in most parts of the world. D) has largely replaced intensive subsistence agriculture in Southeast Asia.

Environmental & Atmospheric Sciences

Permanent equilibrium is a condition that most ecologists now recognize as existing in mature, late-successional ecosystems

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

The greatest threat to global biodiversity is ________

A) habitat destruction B) chemical pollution C) overconsumption of rice, corn, and wheat D) the introduction of alien species

Environmental & Atmospheric Sciences