What is the color of pure ethylene glycol?
A) colorless
B) green
C) red
D) white
A
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When sewage is added to a river, one effect is an increase in dissolved oxygen levels
Indicate whether the statement is true or false.
Many Thailand shrimp farms have been built in mangrove wetlands. Therefore, overall, the ecosystem capital in this particular region has
A) increased because of the investment in this shrimp industry. B) increased because the shrimp farm decreases the need to harvest wild populations of shrimp. C) decreased because the value of the shrimp farm is less than 10% of the value of services provided by the intact mangrove wetland. D) decreased because on average, the shrimp farm provides more valuable services than the original wetland for only 50 years.
Which marine reptiles make long migrations to lay eggs on the very same beach they hatched from?
A) Sea turtles B) Crocodiles C) Lizards D) Sea snakes
How does the ionosphere affect GPS?
A) GPS satellites orbit the Earth in the ionosphere. B) GPS ground stations lose contact with geosynchronous satellites orbiting near the poles. C) GPS signals much pass through the ionosphere, whose gases weaken the signal. D) Positively charged ions in the ionosphere speed up the GPS signal, causing signal error.