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6.a, 6.b A) 2 B) 8 C) 15 D) 25 2.
6.b A) 50 B) 25 C) 85 D) 75 3.
6.b A) All habitats are used by only one animal. B) Population changes in one species do NOT affect other species. C) Humans do NOT affect natural resources. D) Destroying a habitat used by one species can affect the population of other species. 4.
6.b, 6.c A) gold B) trees C) fish D) animals 5.
6.a, 6.b A) Biomass B) Nuclear C) Fossil fuel D) Solar 6.
6.b A) bay B) organic resource C) estuary D) headwaters 7.
6.b, 6.c A) renewable natural resource B) nonrenewable natural resource C) organic resource D) inorganic renewable resource 8.
6.b, 6.c A) silk B) wool C) cotton D) leather 9.
6.a, 6.b A) natural gas B) carbon C) coal D) oil 10.
6.a, 6.b A) water B) coal C) natural gas D) oil 11.
6.a, 6.b A) oil B) carbon C) natural gas D) coal 12.
6.a, 6.b A) pressure and water B) gold and silver C) sand and clay D) decayed plants and animals 13.
6.b A) gold B) gravel C) iron D) sand 14.
6.a, 6.b A) kinetic energy B) geothermal energy C) nuclear energy D) solar energy 15.
6.b, 6.c A) Water moves in cycles through the Earth's ecosystems B) Water cannot be created. C) Water is used for irrigation. D) Water from rivers is used by many people.
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