Vocabulary:Earth's Rocks and Soil

rock : a naturally formed solid in the crust, made up of one or more monerals.

igneous rock : a rock formed when melted rock material cools and hadens.

sedimentary rock : a rock made of bits of matter joined together.

fossil: any remains or imprint of living things of the past.

Metamorphic rock : a rock formed under heat and pressure from another Kind of rock .

humus : adding any harmful substances to Earth's land, water, or air .

rock cycle : rock changing from one form into another in a never -ending of processes.