Oil is sucked up through wide floating heads and pumped into storage tanks. Although suction skimmers are generally very efficient, one disadvantage is that they are vulnerable to becoming clogged by debris and ice and require constant skilled observation.
Explanation:
option no 4 is correct answer
I hope is helpful
A "FORCE" is required to cause acceleration or cause an object to move.
Answer:
This is because, the is less chance of trapping impurities in the developing crystal lattice