Recycling aluminum cans saves ________ % of the energy needed to make the same amount of aluminum from virgin bauxite
A) 25 B) 70 C) 80 D) 50 E) 95
Answer: E
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The scientific peer-review process ensures that ________
A) all scientific studies receive publication despite the level of bias B) the results of scientific studies are permanent and certain C) scientific studies have proper design and methods and are free from bias D) all published scientific studies have clearly defined control groups
The head of a stream generally has a higher gradient than the mouth of a stream.
a. true b. false
Isotopes of an element have
What will be an ideal response?
From the center out, the correct order of the parts of the Sun is
A. core, convection zone, radiative zone, photosphere, chromosphere, corona. B. radiative zone, core, chromosphere, convection zone, photosphere, corona. C. core, radiative zone, convection zone, photosphere, chromosphere, corona. D. core, convection zone, photosphere, chromosphere, corona, radiative zone.