Arock that contains enough of a p a r t i c u l a substance to make it worth mining is called a

An ore  

Explanation:

Ores are rocks that contain enough of a particular substance to make it worth mining.

clouds form

solid ice forms on leaves.

water droplets form on grass.

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.