Final answer:
The Earth's recycling engine is called the rock cycle, which describes how rocks change through geological processes like weathering, erosion, and plate tectonics.
Step-by-step explanation:
The Earth's great recycling engine, perpetually renewing and destroying rock, and ultimately providing humans with critically important natural resources, is called the rock cycle.
The rock cycle describes how rocks continually change through various geological processes such as weathering, erosion, and the movement of tectonic plates.
Examples of processes in the rock cycle include the formation of sedimentary rocks from the lithification of sediment, the formation of igneous rocks from the cooling and solidification of magma, and the formation of metamorphic rocks from the transformation of existing rocks under high pressure and temperature.