The covalent bond is strong because of the electrostatic attraction between the lons

the electrostatic attraction between the positively charge nuclei and shared pair of electrons

the electrostatic attraction between the positively charged ion and shared pair of electrons

All of the above​

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.