What, according to your text, is the most erosive force on the planet?
a) Wind and rain
b) Toxic chemicals
c) Animal grazing
d) Human development
d) Human development
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Which of these changes for an astronaut in orbit?
A. Weight. B. Mass. C. both D. neither
Why are smaller nuclei such as carbon-14 often radioactive? (Carbon-12 is the most common and most stable form of carbon.)
A. The attractive force of the nucleons has a limited range. B. Hmmm... mysterious are the ways of the force. C. The isolated neutron is not stable and will undergo spontaneous transformation into a proton and an electron. D. both A and B E. none of the above
Shades of gray or green in iron-bearing rocks are caused by:
a. native iron b. ferric iron c. ferrous iron d. oxidized iron
Consider the definition of a mineral. Why would a synthetic gemstone fail this definition and not be considered a true mineral?
What will be an ideal response?