Which law of physical science must be followed when balancing chemical equations?

The law of physical science that must be followed when balancing chemical equations is that for every action, there is an equal and opposite reaction. When you make changes to a chemical compound, there will be an equal and opposite reaction to those changes.

Characteristic expected of mineral from lava at earth's surface

phaneritic textures in which phaner means visible so phaneritic textures are standard of impertinent volcanic rocks. these rocks crystallized gradually under the surface of earth. when the magma cools deliberately then the ores have chance to develop and produce long crystals.

Sorry  i don't understand can you rephrase that