Which of the following is true of the antarctic treaty system

the Antarctic Treaty, Antarctica is the only thing continent without  native population is an agreement regulating the international situation. Signed in 1959, began to be implemented in 1961. Has been approved so far been signed by 50 countries.
a Treaty of Antarctica can be used freely for scientific study and indicates the military can not be used for any purpose.
hope this help

Answer steam fog;

Answer (d) may increase or decrease porosity through dissolution or deposition;