__________ is the material rocks are made of.

____________ means to rot away.

____________ are frozen rivers.

__________ are when rocks fall.

____________ means taking away of weathered rock.

________ is made of several sizes of rock.

____________ is the breaking apart of rocks.

_____________ is when sand or rocks settle to the bottom of the ocean.

The smaller pieces of rock that are smaller than sand are called ____________.

_____________ weathering is when rocks fall and break apart into smaller pieces.

______________ weathering is when minerals in rocks are changed by chemicals in water and air.