The most recent ancestor of modern humans that evolved about 35,000 years ago is
____________________. Fill in the blank(s) with the appropriate word(s).
Cro-Magnon
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A crystal of potassium feldspar (KAlSi3O8) will produce a variety of weathering products after it is weathered. Which of the following is not a product that results from the weathering of potassium feldspar?
A) silica B) potassium ions C) clay minerals D) iron oxides
Considering the age of the Earth and that the half-life of the isotope uranium-238 (238U) is 4.5 billion years, and assuming no additional 238U was produced after the Earth formed, approximately what fraction is left on Earth?
A. one-third B. none C. eighty percent D. half
Rounded peds have more pore space and permeability than do other ped shapes
Indicate whether the statement is true or false
Liquid water has the unique physical property of contracting in size by ~9% upon freezing.
a. true b. false