How is global temperature estimated from ice samples?
A) by looking at the types of gases dissolved in the ice
B) by measuring the density of the ice
C) by measuring the depth of the ice
D) by looking at the pollen trapped in the air pockets in the ice
E) none of the above
Question 2
What is the cause of the greenhouse effect?
A) different materials absorb, reflect and transmit electromagnetic radiation differently
B) excess gases in the atmosphere
C) solar radiation causing chemical changes in the concentration of gases in the atmosphere
D) human activities changing the chemical makeup of the atmosphere
E) none of the above