Despite a fast growing population, urban growth has remained slow as few Africans choose to leave the rural areas
a. True
b. False
Indicate whether the statement is true or false
False
RATIONALE: Urban growth is very fast; the number of cities with a population of 1 million or more has doubled in the last two decades. It is projected that over half of Africa's population will live in cities by 2050.
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As the difference between the air temperature and the dew point increases, the relative humidity ____
A) increases B) decreases C) remains constant at a value less than 100% D) remains constant and equal to 100%
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%
The average moist adiabatic rate is 6 C°/1000 m (3.3 F°/1000 ft), but values actually vary as a function of both temperature and moisture content
Indicate whether the statement is true or false
Even though Earth is cooler than the Sun, it emits much more radiation than the Sun
a. True b. False