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.
In plant fossils, stomatal density is used to estimate CO2 concentration in the atmosphere
Fragile and tenuous atmosphere that is vulnerable to the impacts of human activity
Percent of oxygen in the atmosphere versus altitude.
Earth’s Oldest Preserved Rocks – 3.8 Billion Years Old, Greenland
Controls of Temperature
The xy plane is painted with a uniform surface charge density which is equal to 40 nC/m2 . ...