What percentage of Earth's freshwater is accessible in surface rivers and lakes?
A) 70% B) 1% C) 30% D) 10% E) 97%
B) 1%
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What features can you observe in a rock sample or outcrop that would permit you to recognize a rock as being metamorphic, rather than igneous or sedimentary?
What will be an ideal response?
All of the following are typical effects of dam construction except
A. interruption of the normal seasonal variation in flows of water. B. increased amount of sediment carried downstream of the dam. C. protecting towns from flooding. D. disruption of natural ecosystems.
When are the Sun's rays perpendicular to Earth's surface at the equator? Choose all that apply.
A) March Equinox B) December Solstice C) June Solstice D) September Equinox
Bioremediation is a restoration strategy that
A. determines that a contaminated site is healthy because one species can thrive on it B. brings in different species to see which ones will thrive best in a polluted area C. uses living organisms such as plants and bacteria to eliminate toxins from the ecosystem D. is a labor-intensive process where contaminated soil must be removed and replaced before plants and animals can grow