Greenhouse gases cause a rise in temperature by
A. trapping heat in the atmosphere
B. Lowering the temperature
C. increasing permafrost
D. All of the above

Explain how a convection current in the earth is formed.

Physical features of central america look at the map above which of the following is true

All of the following are reasons why deserts extremely susceptible to wind erosion except a. they lack major root systems b. they contain thin, dry soil c. they have very few plants and trees d. they are extremely hot and lack water