The gaseous oxygen in Earth's early atmosphere was a by-product of
A) photosynthesis.
B) photochemical reactions breaking down ozone (O3 ) to form oxygen (O2 ).
C) volcanic outgassing.
D) decay of organic matter.
A
You might also like to view...
Full-cost pricing could potentially mitigate many of the detrimental impacts associated with resource waste, pollution and other environmental problems. Why isn't full-cost pricing widely used? What could be done to overcome these problems?
What will be an ideal response?
Transdniestria is officially part of:
A) Russia B) Ukraine C) Poland D) Moldova
Rock salt and rock gypsum are examples of ________ sedimentary rocks
A) biochemical B) chemical C) organic D) detrital
China has lower costs for the mining of rare earth minerals because of ____.
A. the lack of strict environmental regulations B. their larger deposits C. the proximity of their deposits to the earth's surface D. the accessibility of their minerals without subsurface mining E. superior mining technology