What percentage of Earth's surface is covered with water?
A) 42% B) 70% C) 80% D) 23% E) 56%
Answer: B
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Which of the following must balance the vertical pressure gradient force so that the atmosphere around the Earth does not rush off into space?
A. horizontal pressure gradient force B. centripetal force C. Coriolis force D. gravity
How are pristine conditions of the atmosphere determined?
A) Research conducted prior to the Industrial Revolution B) Seawater samples from deep within polar ice packs C) Sediment samples D) All of these choices
Which type of organism is responsible for harmful algal blooms, or HABs?
A) diatoms B) dinoflagellates C) coccolithophores D) foraminifera
Global satellite imagery of land on Earth over the past 20 years reveals
A) a net improvement of the quality and area of cropland. B) a net decline in the overall quality of cropland. C) the loss of more than 5% of land to the construction of new lakes and dams for electrical generation. D) a loss of more than 7% of land mass due to rising ocean levels.