Investigation 1 Vocabulary

any natural resource that makes up earth, including soil and water.

• Earth

• earth materials

• materials

weathered rock material with particles typically between 6–64 mm.

• pebbles

• gravel

• silt

• sand

weathered rock material with particles typically between 2–6 mm.

• pebbles

• gravel

• silt

• sand

 weathered rock material with particles typically between 1–2 mm.

• pebbles

• gravel

• sand

• silt

rocks that are smaller than sand but bigger than clay

• sand

• gravel

• silt

• pebbles

Clay

• weathered rock material with particles typically between 1–2 mm.

• rocks that are smaller than sand but bigger than clay

• bits of dead plant and animal parts in the soil, a solid earth material made of two or more minerals.

• rocks that are too small to see without a hand lens.

Humus rock

•  weathered rock material with particles typically between 1–2 mm

• rocks that are smaller than sand but bigger than clay

• bits of dead plant and animal parts in the soil, a solid earth material made of two or more minerals.

• rocks that are too small to see without a hand lens.

Weathering

•  rocks are broken down but chemical properties do not change.

•  the process of being worn down over a long period of time.

• the process of scraping or wearing away

• to change from a liquid to a solid state as a result of cooling.

physical weathering

• rocks are broken down but chemical properties do not change

• to change from a liquid to a solid state as a result of cooling

• to get bigger; to take up more space

• the process of scraping or wearing away

the process of scraping or wearing away

• physical weathering

• freezing

• abrasion

• expansion