Secondary urbanization in the Nile Valley included the following characteristics:

A) sub-Saharan trade, monumental tombs, mathematics
B) first forms of writing, urban city walls, fishers and farmers
C) Greco-Roman architecture, theaters, Christianity
D) Islamic architecture, public baths, casbah
E) none of the above


Answer: A

Environmental & Atmospheric Sciences

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Flood irrigation is the most efficient method of delivering water needed for crops.

Answer the following statement true (T) or false (F)

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Continental crust is not always thicker than oceanic crust

Indicate whether the statement is true or false

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The isohypses portrayed here show



A) high pressure, northern hemisphere.
B) low pressure, northern hemisphere.
C) low pressure, southern hemisphere.
D) high pressure, southern hemisphere.

Environmental & Atmospheric Sciences

Nearly 300 million years ago, dragonflies existed that were the size of large hawks today. Some scientists believe that these giants could fly then, but not today, because oxygen levels in the atmosphere were much greater

If oxygen levels 300 million years ago were 50% higher than today, what percentage of the atmosphere would have consisted of oxygen for these giant dragonflies? A) 30% B) 20% C) 10% D) 2%

Environmental & Atmospheric Sciences