The classification of rocks into three major categories is based on

On their mode of formation

Explanation:

The classification of rocks into three major categories is strictly based on their mode of formation.

Rocks are naturally formed aggregates of minerals. Based on mode of formation, they can be classified into;

Igneous rocks: these rocks are formed by the cooling and solidification of molten magma. Sedimentary rocks are formed by the compaction and lithification of sediment. Metamorphic rocks: these are changed rocks that have been formed by subjecting rocks to pressure and temperature conditions which causes an alteration of their minerology.

Sequoia national park  /  inyo national forest, california, u.s. mount whitney is the tallest mountain in california, as well as the highest summit in the contiguous united states and thesierra nevada—with an elevation of 14,505 feet (4,421 m).

Why the planet stays in orbit is because of inertia (object stays in motion until a force changes it’s motion) also the atmosphere and gravity!