The totality of materials ejected from a volcano, including liquid material, ashes and dust is termed ______.
a - pyroclastic material
b - lava
c - granite
d - magma
e - silica
a - pyroclastic material
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How are carbon dioxide and other trace gases thought to be potentially related to global warming? Are the levels of these gases in our atmosphere increasing or decreasing and why are levels changing? Finally, what are some of the observed climatic
trends and possible consequences associated with global warming?
Urban geographers are quite interested in all of the following except
A) how the identities of urban areas evolve. B) relationships between urban areas and surrounding territory. C) land-use within urban areas. D) rural and pastoral areas.
This soil profile is in an area where
A) rainy conditions persist year-round.
B) dry conditions persist year-round.
C) conditions are neither too wet nor too dry.
Organic material in sediment layers is dated by measuring the amount of radioactive ________ present.
A. oxygen B. sodium C. hydrogen D. uranium E. carbon