Across
- 3. a loose granular substance, typically pale yellowish brown, resulting from the erosion of other rocks and forming a major component of beaches, riverbeds, the seabed, and deserts.
- 4. a mixture of small stones
- 8. a scientist who studies how water circulates on the earth’s surface, underground, and in the atmosphere
- 9. the organic component of soil, formed by the decomposition of leaves and other plant material by soil microorganisms
- 10. the top layer of earth, composed of organic materials (humus), inorganic materials (sand, silt, and clay)
- 11. a small version of an object or a process that scientists use to study an actual thing or event.
Down
- 1. a procedure that is carried out to investigate a scientific question
- 2. cycle the process by which water moves through the ground, evaporates from earth into the air, forms clouds, and falls back to earth as rain or snow
- 5. a stiff, sticky fine-grained earth, typically yellow, red, or bluish-gray in color. A layer of soil that can be molded when wet, and is dried and baked to make bricks, pottery, and ceramics.
- 6. a prediction about how something works or how two variables are related
- 7. an element in an experiment that can be changed