Outgassing and ____ are probable sources for Earth's early water vapor
A)solar wind
B)icy comets
C)photochemical dissociation
D)land plants
E)the ozone layer
B
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What marks the limit of rapid marine erosion?
A) Sea cliffs B) Wave-cut platforms C) Sea caves D) Blowholes
Which of the following generates most ocean waves?
A) Large objects falling into the ocean B) Passing ships at the surface C) The movement of different air masses D) Tidal movement and turbidity currents E) Wind blowing across the surface
High grading can be defined as ________
A) the natural frequency and severity of fires in a forest B) a forest that has been largely unaffected by humans C) the loss of biodiversity of forest areas D) removal of particular species of trees for fuel and construction E) artificially or naturally reforested areas
Using the most reliable information available, how much of the Earth's land surface is used for agriculture today?
What will be an ideal response?