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.
The Moon’s Interior and Its Effects on the Moon’s Surface
The geomagnetic polarity time scale shows how Earth’s magnetic pole has changed through geologic tim
Benvenuto Cellini, Saltcellar: Neptune (Sea) and Tellus (Earth).
The climate is changing rapidly, and greenhouse gases are the most likely cause.
Coal pollutes the atmosphere
Earth 65 Million Years Ago