An igneous rock texture in which larger crystals are enclosed in a groundmass of much finer-grained material is called:
a) aphanitic texture
b) phaneritic texture
c) polyphonic texture
d) porphyritic texture
e) mylonitic texture
Ans: d) porphyritic texture
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Indicate whether the statement is true or false
What ecosystem services from U.S. national forests had the greatest demands placed on them following World War II and the country's rapid population growth?
A) soil formation and agriculture B) grazing and agriculture C) soil formation and wilderness protection D) food, fiber, and plant growth E) grazing, recreation, and timber resources
Urbanization in the Russian region
A) was helped by laws allowing unrestricted internal migration during the Soviet period. B) did not really increase significantly until the 1960s. C) was discouraged throughout the history of the Russian Domain. D) was often planned in detail during the Soviet period. E) is far below that of Western Europe.
In the 19th century the famous physicist Lord Kelvin estimated the age of Earth to be much much less than its present estimate. What information did Kelvin not have to account for his error?
A) Lord Kelvin knew only classical physics and had no knowledge of anthropological dating. B) Lord Kelvin had no knowledge of radio waves for measuring distance and age of planets since they have not yet been introduced into science. C) Lord Kelvin was not aware of radioactive decay, a source of energy to keep Earth warm for billions of years. D) Lord Kelvin never gave any estimate of the age of Earth.