Finer grained standards that are part of this one
Components of Earth’s system include minerals, rocks, soil, water and air. These materials can be observed, sorted and/or classified based on their physical properties.
Water can exist as a solid, liquid or gas and in different forms such as rain, snow and ice.
Sand, clay and humus have distinct physical properties and are components of soils.
A soil’s composition varies from environment to environment.
Soil type can be identified by testing for grain size and composition.
Rocks are natural combinations of minerals. Minerals can be classified according to their physical properties (i.e., luster, color and hardness).