The cleanest burning alternative among the fossil fuels is ______________ __________
Fill in the blanks with correct word
natural gas
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Cepheids are types of stars that regularly change how bright they are over a period of a few
A. days. B. decades. C. year. D. months.
Government regulators are often forbidden from taking market principles into account when deciding how to manage resources
Indicate whether the statement is true or false.
This figure shows the geologic timescale. Which period listed below would be part of the Mesozoic?
A. Cambrian B. Jurassic C. Pennsylvanian D. Mississippian E. Neogene
Which one of the following principles of smart-growth will most likely result in more wildlife habitat and scenic beauty within established suburban neighborhoods?
A) Have states purchase open spaces that are then preserved from urban development. B) Set physical boundaries on urban sprawl. C) Build new homes and stores on existing abandoned or brownfield urban properties. D) Promote the integration of homes, stores, light industry, and professional offices.