According to a 2007 IPCC report, with what amount of probability is it that human activities have been the leading cause of the observed atmospheric warming?
a. at least 50%
b. at least 60%
c. at least 70%
d. at least 80%
e. at least 90%
E
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The mineral gold (Au) is very soft. Gold's softness can be attributed to
A) large, tightly packed atoms. B) small, loosely bonded atoms. C) large, loosely packed, and loosely bonded atoms. D) large, closely packed, and strong bonded atoms.
A rock sample appears to have different layers, seemingly made of sand particles. How would you genetically classify this sample?
A) metamorphic B) sedimentary C) igneous D) chemical
From the list provided below, choose those observations that accurately describe the mineral presented in this image.
A. This mineral effervesces with dilute HCl without being pulverized into a fine powder. B. This mineral displays two directions of cleavage. C. This mineral flakes into thin sheets.
Unfenced grasslands in tropical and temperate climates that supply forage for grazing animals are called ____.
A. pastures B. rangeland C. savannah D. steppes E. veldt