4th Grade Soils, Rocks, and Landforms

The rubbing, grinding, and bumping of rocks that cause physical weathering

• acid

• basin

• abrasion

• acid rain

A substance that geologists use to identify rocks that contain calcite

• calcite

• abrasion

• acid

• clay

A process in which two or more materials mix in a way that forms new materials

• physical reaction

• conglomerate

• decay

• chemical reaction

When a material mixes uniformly into another

• decay

• dissolve

• erosion

• fracture

The uneven, rounded, or splintered surfaces of some minerals when they break

• fracture

• decay

• expand

• nutrient

Ingredient of a rock

• natural resource

• geologist

• property

• mineral

The largest category of rock pieces; component of soil

• particle

• property

• pebble

• nutrient

A material such as soil or water that comes from the natural environment

• natural resource

• pebble

• sand

• sediment

A mix of humus, sand, silt, clay, gravel, and/or pebbles

• silt

• soil

• sediment

• particle

Something that you can observe about an object or a material. Size, color, shape, texture, and smell are properties

• property

• physical change

• chemical change

• erosion