Suppose Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be
A) 250 K, which is well below freezing.
B) 273 K, or about the freezing point for water.
C) 283 K, or about 5 K cooler than it is now.
D) 288 K, or about the same as it is now.
E) 293 K, or about 5 K warmer than it is now.
Question 2
Mars' magnetic field is so weak because
A) it spins much slower than Earth does.
B) it core may no longer be molten.
C) its core contains less iron than our own.
D) Both B and C are probable.
E) All of the above are correct.
Examples of structures in which extensive surface area is important for function.
Hand mnemonic for the basic atmosphere composition being 4/5 nitrogen and 1/5 oxygen.
Advantages and disadvantages of select temperature measurement sites
Average Chemical Composition of the Geosphere Crust
IPCC Temperature Increase Predictions Relative to 1986-2005
How Does Earth Work? Physical Geology and the Process of Science, 2nd Edition