Soil is located on the upper part of the Earth's crust. It is composed of_____ rock, humus, water, and air. Weathered rock is rock that has been broken into smaller pieces._________ is organic matter what gets mixed into the weathered rock to form soil. _______ can take a thousand years to form, so it is considered a ________ resource. Weathered rock formed from different sources. In addition, the pieces of weathered rock can be moved from one place (__________) and put in a new place (_________). This explains why soils in different places have different compositions. Rich soil helps to support a wide variety of ________ things, including plants, animals, and microorganisms. It also as a _________. _________ can lead to excessive erosion and contamination of soil.

- Weathered

- Humus
- Soil
- Limited
- Erosion
- Deposition
- Living
- pH imbalance