The number of human-caused oil spills in the ocean have decreased since the 1970s.
Answer the following statement true (T) or false (F)
True
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The current population of the Earth is about ________
A) 2 billion B) 5 billion C) 7 billion D) 9 billion E) 500,000
How large is a typical, single air mass?
A. The size of a continent (e.g., North America) B. The size of a larger state (e.g., Wyoming) C. The size of a region (e.g., eastern United States) D. The size of a small state (e.g., Delaware)
The orange-and-apple sequence of your textbook emphasizes
A. that forces produce accelerations. B. friction defined as a force. C. that actions equal reactions. D. the definition of systems.
Ordinary thunderstorms only last about one hour and begin to dissipate when:a
lightning neutralizes all the electrical charge in the cloud b. when all the precipitation particles in the cloud turn to ice c. when the downdraft spreads throughout the cloud and cuts off the updraft d. when solar heating at the ground begins to decrease