At which locations is solar energy most concentrated?
A) Where the Sun is closest to the curved surface of Earth
B) Anywhere on Earth, if it is the perihelion
C) At places where the angle of incidence is 90°
D) At places where the angle of incidence is 0°
E) Where the atmosphere has the most water vapor
Answer: C
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Humans use more fresh water for ________ than for any other purpose
A) washing and home use B) mining and industrial processes C) agricultural irrigation D) drinking and cooking E) electrical production
How is the tail of a comet oriented? (Which way does it point?)
a. ?It points away from the sun. b. ?It points toward the sun due to gravitational attraction. c. ?It points back from the direction of travel. d. ?It points in the direction of its afterburner. e. ?It oriented randomly in space.
The value of currency compared with that of another country is called the ________ ________
Fill in the blank(s) with correct word
The U.S. generates how much of the world's solid waste?
A. 33% B. 40% C. 50% D. 25%