The total number of cataloged species on Earth in both marine and terrestrial environments is currently 1.8 ________
A) thousand
B) million
C) billion
D) trillion
E) quadrillion
B
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For the following balanced reaction, which of the following is a solid? 2 Na(l) + Cl2(g) ? 2 NaCl(s)
A. Cl2 B. NaCl C. Cl D. Na E. 2 Na
What are some of the questions focused by geologists?
a. The formation and composition of our planet b. The causes of earthquakes and ice ages c. The evolution of life d. Protection of water resources e. Exploration of oil and ores d. Environmental remediation f. All of the above
The earth has sustained life for ____ years.
A. 1.5 million B. 3.8 million C. 1.5 billion D. 3.8 billion E. 1.5 trillion
What created the Dust Bowl?
A. Intense land cultivation B. Both a drought and intense land cultivation C. The drying up of the Ogallala Aquifer D. A large, engineered water diversion E. A drought