The time in Earth’s history before 4 billion years (4000 m.y.) is known as the ____
a. Hadean
b. Proterozoic
c. Archean
d. Paleoarchean
e. Eoarchean
a
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As seen from Earth, if one satellite appears to overtake another, the faster satellite is
A. sometime higher, sometimes lower. B. lower. C. higher. D. can't say
The German Blue Angel and U.S. Green Seal are
A. Environmental endorsements of products B. Newly established political parties C. A set of new environmental quality goals D. Public relation icons for the two federal governments E. Measures of corporate responsibility
Which theory explains how glacial material can be observed today near sea level at the equator, even though sea level glaciers probably never existed there?
A) Milankovitch theory B) theory of plate tectonics C) volcanic dust theory D) Maunder theory
If a mineral is opaque, lustrous, malleable and can conduct heat and electricity, it is a(n) ________
A) element B) metal C) radioactive element D) crystal E) gemstone