Question

The law of conservation of matter states that matter can neither be created nor destroyed. How is the law of conservation of matter applied to rocks and other materials? In your own words, explain with the help of an appropriate model.

Answer 1

See the basics of geology - the three states of rock - where do they come from etc. (sedimentary, metaphoric rocks, igneous rock, what is the cycle)
No matter what you do with the rock, the matter will still exist, maybe in a different matter (a rock can obviously become liquified - see volcanoes, see underground, when it comes back onto ground, it will cool down and become solid)

Same could be presented on the cycle of water - water vaporizes from oceans, rains into rivers, gets back into oceans etc.