Phytoplankton productivity has dropped by 9% in the last 20 years. Indicate whether the statement is true or false
ANS: T
This overall change in plankton productivity could be an indication of global climate change. The
reduction could be due to the warmer ocean water or diminished winds. Information can be found in
the section Human Activity is Causing Global Oceanic Change.
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GNI per capita is the only economic indicator needed to determine the level of development of a country
Indicate whether the statement is true or false.
Natural glass such as obsidian forms when ____
A)magma cools too rapidly for crystals to form B)pegmatite melts, moves to Earth's surface and ,re-forms C)magma cools too slowly for crystals to form D)magma has a very low silica content E)gas escapes through lava
Some geographers believe sustainable development will bring about the "Third Revolution," a shift in human ways of interacting with the Earth so dramatic that it will be compared with the origins of agriculture and industry
a. True b. False Indicate whether the statement is true or false
Productivity in an ecosystem has to do with:
A. The combined metabolic rate of the biological communities B. The number of different species living in the ecosystem C. The efficiency of its primary producers D. Its longevity E. Its rate of producing biomass