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

Environmental & Atmospheric Sciences

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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

Environmental & Atmospheric Sciences

Rounded peds have more pore space and permeability than do other ped shapes

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

Liquid water has the unique physical property of contracting in size by ~9% upon freezing.

a. true b. false

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences