Convection occurs in the troposphere but not in the stratosphere because
A) the troposphere is warmer than the stratosphere.
B) the troposphere is cooler than the stratosphere.
C) lower altitudes of the troposphere are warmer than higher altitudes, unlike in the stratosphere.
D) higher altitudes of the troposphere are warmer than lower altitudes, unlike in the stratosphere.
E) the troposphere contains fewer greenhouse gases than the stratosphere.
Question 2
When is/was gravitational contraction an important energy generation mechanism for the Sun?
A) It was important when the Sun was forming from a shrinking interstellar cloud of gas.
B) It is the primary energy generation mechanism in the Sun today.
C) It has played a role throughout the Sun's history, but it was most important right after nuclear fusion began in the Sun's core.
D) It is important during periods when the Sun is going from solar maximum to solar minimum.
A melanistic jaguar is a colour morph which occurs at about 6% frequency in populations.
Compression Occurs in vertebrae subjected to extreme stresses, as when one falls and lands on his or
The transition between steps usually occurs at a temperature that would not interfere with cold ...
Processes of the Middle and Upper Troposphere: Rossby Waves and Vorticity
The glutamine synthetase reaction occurs via an acyl phosphate intermediate
Biosynthesis of methionine and threonine from homoserine, as it occurs in plants and bacteria