What region's agricultural land is almost totally developed?
A) Africa
B) Australia
C) South America
D) South Asia
E) All of the above have no land left to expand agriculture.
D
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Studies of past climates have shown that climate has varied only on time scales of tens of thousands to millions of years
Indicate whether the statement is true or false
What was the main economic engine of Spanish California?
A) Gold mining B) Cattle ranching C) Wheat farming D) Ocean Fishing
The first comprehensive national law to manage water quality was the ________
A) Clean Water Act B) Safe Drinking Water Act C) Water Pollution Control Act D) Clear Drinking Water Act E) Oil Pollution Control Act
The albedo of Earth's surface is only about 4%, yet the combined albedo of Earth and its atmosphere is about 30%. Which set of conditions below best explains why this is so?
A) high albedo of clouds; low albedo of water B) high albedo of clouds; high albedo of water C) low albedo of clouds; low albedo of water D) low albedo of clouds; high albedo of water