What two processes, which began during the Archean, can account for the introduction of free oxygen into the atmosphere?
The two processes are photochemical dissociation and photosynthesis.
You might also like to view...
The tropical atmospheric circulation associated with rising winds along the intertropical convergence zone (ITCZ) and descending air in the subtropics are called
A) Rosby waves. B) Ferrel cells. C) polar cells. D) Hadley cells. E) Jet stream.
Buildings like the former World Trade Center in New York can simultaneously be part of a landscape of power and a symbolic landscape
Indicate whether this statement is true or false.
The monsoon forests, from Myanmar to Indochina and the Philippines, have extensive areas of forest dominated by ___________________.
Fill in the blank(s) with the appropriate word(s).
Isaac Newton reasoned that Earth was not perfectly spherical because of
A) centrifugal force created by Earth's more rapid rotation at the equator. B) centrifugal force created by Earth's more rapid rotation at the poles. C) gravitational force created by Earth's more rapid rotation at the equator. D) gravitational force created by Earth's more rapid rotation at the poles.