According to optimistic estimates, the end of habitability of Earth will come about
A) a few hundred thousand years from now
B) a billion years from now
C) 3 to 4 billion years from now
D) 100 million years from now
Question 2
The process whereby heat flows by the mass movement of molecules from one place to another is referred to as
A) conduction.
B) convection.
C) radiation.
D) inversion.
E) evaporation.
