To people on earth, this turning of the planet makes it seem as though the sun, moon, planets, and stars are orbiting the earth once a day. Clouds and fog are made of tiny droplets of water. Air is a substance that surrounds us, takes up space, and whose movement we feel as wind. The FOSS program does not include a component developing concepts related to The Universe and the Earth at this level. Rock is composed of different combinations of minerals.
Smaller rocks come from the breakage and weathering of bedrock and larger rocks.
Many kinds of changes occur faster under hotter conditions. Materials may be composed of parts that are too small to be seen without magnification. When a new material is made by combining two or more materials, it has properties that are different from the original materials. For that reason, a lot of different materials can be made from a small number of basic kinds of materials. Students investigating landforms use stream tables to observe and measure the effects of flowing water.