______ is used to organize Earth's long history into manageable parts.

______ is any method of measuring the actual age of something in years.

______ is a large-moving mass of ice that exists year-round and flows slowly over head.

_____ are traces or remains of organisms.

_______ is large regions of Earth's crust being pushed up toward the surface.

________ is all of Earth's known fossils and the information they provide.

______ is the theory that describes how Earth's outer layer is broken up into moving tectonic plates.

_____ are the large moving pieces of Earth's crust.

______ are formed from melting and cooling.

______ is any method of determining whether something is older or younger than something else.

_____ occurs when eroded materials are dropped or laid down.

_____ is fragments of weathered rock.

_____ is a series of processes in which rocks change from one type to another.

____ forms from erosion, deposition, and cementation.

____ is a giant continuous mountain range.

_____ is how old something is compared to how old something else is.

_____ is the process by which wind, water, ice, or gravity transports weathered materials from one location to another.

______ forms from heat and pressure.

______ is the deepest valley on Earth's surface.