How does petrified wood form?
a. permineralization – silica rich waters percolates and silicifies the wood
b. aeration – the wood dries out and is then buried
c. decomposition – bacteria break down the wood and replace them with organic compounds
d. decomposition – bacteria break down the wood and replace it with inorganic compounds
e. tectonism – wood is rapidly buried and subsequently uplifted
a
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For a given wind speed, the Coriolis force would be weakest at ____ degrees latitude
A) 10 B) 25 C) 40 D) 60 E) 90
Ethnicity is important because
A) it provides the only stable basis of political states in the modern world. B) it opposes nationalism and globalization. C) it promotes peace and wellbeing in the face of the globalization of culture. D) it reinforces diversity in the face of the globalization of culture. E) it defines citizenship and sovereignty in the political arena.
In the last 8,000 years, humans have reduced the earth's original forest cover by about 23%.
Answer the following statement true (T) or false (F)
Which mass wasting process involved volcanically derived material from the eruption of Nevado del Ruiz and destroyed the city of Armero in 1985?
A) Lahar B) Rockfall C) Solifluction D) Debris flow