Aphanitic texture is characteristic of:
a. intrusive rocks
b. extrusive rocks
c. porphyritic rocks
d. pyroclastic rocks
b
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Water pipes sometimes burst at low temperatures because
A. the thawing process produces pressure on the pipes. B. the ground contracts when colder, pulling pipes apart. C. water contracts when freezing. D. water expands when freezing.
A rock that is 90 million years old comes from the ________ Period
A) Cretaceous B) Mesozoic C) Phanerozoic D) Jurassic
A hanging valley forms from the eroded valley of a tributary valley glacier that met the trunk valley
glacier at an elevation high above the valley floor of the latter. What will be an ideal response?
The most abundant greenhouse gas in the earth's atmosphere is:
a. carbon dioxide (CO2). b. nitrous oxide (N2O). c. water vapor (H2O). d. methane (CH4). e. chlorofluorocarbons (CFCs).