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Name: ________________________________ Science 7-______ Johnston Date: ___________________________ Weathering, Erosion, and Natural Catastrophe Test Review Completion Complete each statement. 1. Most of the work of mixing humus within the soil is done by ___________________. 2. Reusing water in a factory to cool hot machinery is a way to _________________ water. 3. ____________________ are organisms in the soil that break down and digest the remains of dead organisms. 4. Natural hazards can cause __________________ events that change Earth's crust. 5. The process in which sediment is laid down in a new location is called ___________________. 6. What type of energy is involved when a river moves sediment and erodes its banks? _____________________ 7. _________________ causes mechanical weathering of rock by means of freezing and thawing of water. 8. A ____________________ can occur when there is too great a demand for water in an area. 9. List five natural hazards. ____________________________________________ 10. Erosion by water or wind can cause the loss of soil that is not protected by _________________. 11. A rock containing iron becomes soft and crumbly and reddish-brown. It probably has been chemically weathered by ______________. 12. Farming is difficult in many parts of the world for the following reasons too much _____________ in soil. 13. A lake ____________ be formed by water flowing quickly through a narrow channel. 14. The growth of plant roots and animal activity may result in ________________________. 15. Most of Earth's ________________ is found in huge masses of ice near the North and South Poles. I, __________________________________________ (printed parent name), confirm that my child, _____________________________________________ (student’s printed name), has studied this review at least 30 minutes for the upcoming assessment. A parent signature adds 5 bonus points towards the upcoming test. parent signature: _________________________________________________ Name: ________________________________ Science 7-______ Johnston Date: ___________________________ 16. The decayed organic material in soil is called ______________. 17. As water moves slowly through a ____________, plants within it filter out waste materials. 18. The mixture of rock particles, minerals, decayed organic material, air, and water is called ____________. 19. A hot and wet climate causes weathering to take place ____________ than when the climate is dry and cool. 20. Cutting down forests is a human activity that can make the impact of natural hazards more ____________. 21. Potential energy changes to kinetic energy as ___________ pulls water down a slope. 22. A geologist finds deep gouges and scratches on bedrock in an area once covered by a glacier. These scratches are evidence of the type of erosion called _____________. 23. The energy that produces ocean waves comes from __________ blowing across the water's surface. 24. Living organisms in soil help to mix the soil and make ___________. 25. In a cross section of soil, the _________________ consists of clay, minerals, and little humus. 26. The type of soil called _________ is made up of nearly equal amounts of silt, sand, and clay. 27. Label each cross section of soil and list what it is composed of.