The earliest known hominid fossils are from rocks that are ____
a. 1.5 million years old
b. 700,000 years old
c. 10,000 years old
d. 7 million years old
e. 4 million years old
d
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Areas of shallow wetlands called prairie potholes were formed by what physical process?
A) Sheet erosion B) Rill erosion C) Aeolian processes D) Glacial processes
Other than ice sheets and glaciers, the largest repository of fresh water is located in
A) soil moisture storage. B) lakes and saline seas. C) rivers and streams. D) groundwater. E) atmospheric water vapor.
Billions of poverty-stricken people do not have access to basic necessities of life. The lack of which one of the following basic necessities affects the largest number of people?
a. enough fuel for heating and cooking b. adequate sanitation facilities c. clean drinking water d. adequate housing e. enough food for good health
A catastrophic earthquake is one with a magnitude over 9.0. It has strong effects over areas thousands of miles in diameter. Catastrophic earthquakes are recorded about once every
A. 20 years. B. month. C. 500 years. D. 2 years.