1. Which layer in a soil profile contains the most organic matter?A. C-horizonB. A-horizonC. B-horizonD. O-horizon2. Where is the water table located?A. Under the zone of saturationB. Below the layer of bedrockC. At the top of the zone of saturationD. In the layer of bedrock3. Which one of the following types of rock would weather the fastest?A. Large blocks of graniteB. Large blocks of clayC. Small pieces of graniteD. Small pieces of clay4. The factors that allow a river to erode materials include all of the following exceptA. shape of the riverbed.B. temperature of the river.C. amount of river discharge.D. slope of the river.5. What is not a typical result of wind erosion?A. Large rocks are left behind.B. Dry soil is left behind.C. Wet soil is left behind.D. Small rocks are transported away.6. Carbonic acid forms when carbon dioxide is absorbed into water. The action of carbonic acid on may produce sinkholes, caverns, and formations like stalagmites.A. limestoneB. sandstoneC. clayD. granite7. Which one of the following is a source of chemical weathering?A. The growth of mosses in the cracks of rocksB. Water freezing in the cracks of exposed rocksC. The abrasion of running waterD. The effects of acid from decaying animals8. Calcium is carried in water by a process known asA. solution.B. flotation.C. suspension.D. traction.9. An example of an impermeable material isA. clay.B. sand.C. gravel.D. water.10. What is the process by which water dissolves certain minerals in the soil and carries them away?A. AbrasionB. LeachingC. WeatheringD. Erosion11. Headwaters are usually foundA. at the mouth of a river.B. near land drained by a river system.C. high in the mountains.D. in large channels in flat areas.12. The Grand Canyon was formed as a result ofA. deposition.B. erosion.C. deflation.D. landslides.13. Loam is made up of all of the following materials exceptA. clay.B. silt.C. gravel.D. air.14. An underground layer of permeable material that contains groundwater is called a/anA. aquifer.B. water table.C. headwaters region.D. zone of saturation.15. Deflation is a process of erosion by which leaves desert pavement behind.A. windB. waterC. temperatureD. time16. The beginning of a river is usually locatedA. near the base of a divide.B. near the mouth of the river.C. high in the mountains.D. at the bottom of its watershed.17. The decayed organic matter in soil which is beneficial to plant growth is calledA. silt.B. loam.C. humus.D. clay.18. The most important measure of the size of a river is theA. width of its mouth.B. number of its tributaries.C. size of its watershed.D. volume of its discharge.19. In referring to Earths systems, which one of the following statements is accurate for an open system?A. An open system exchanges energy with its surroundings.B. An open system is unchanging.C. An open system is unaffected by outside objects.D. The human influence has little effect on an open system.20. Which one of the following statements is correct?End of examA. Stalagmites are formed from water containing salt.B. Stalagmites form on the ceiling of a cavern.C. Stalagmites are cone-shaped deposits.D. Stalagmites are narrower than stalactites.