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
You might also like to view...
Relative to ultraviolet waves, the frequency of infrared waves is
A. about the same. B. higher. C. less. D. not enough information
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.
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
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