1) The very top layer of soil is mostly made of a) Mostly organic material (humus) b) Solid rock c) A mixture of minerals and organic material d) Clay and mineral deposits 2) Which layer of soil is on the bottom? a) topsoil b) bedrock c) SOx d) subsoil e) bottomsoil 3) Soil is made of a) weathered rocks and minerals b) air and water c) dead plants and animals d) all of the above 4) Why is soil an important natural resource? a) soil can grow crops b) soil is full of microbes c) soil is used to make buildings d) soil comes from bedrock 5) The way soil feels is called its _____. a) type b) particle c) texture d) grain size e) water holding capacity 6) You did an experiment to see how adding humus would improve plant growth. You added humus to plant A and kept plant B in regular soil. They both got the same amount of sunlight and water. Based on the results, what can you conclude? a) Plant A will not grow any flowers b) Humus made plant A grow faster c) Plant B will die d) Humus had not effect on plant A 7) The texture of soil depends on a) How much water it can retain b) Soil color c) Particle size d) Soil mass 8) A student wants to know which soil is the best to plant tomatoes in. Which of the following experiments can he complete to figure it out? a) Plant seeds in each type of soil. b) Compare the color of the soil to a color chart c) Pour 200 mL of water into each soil to see how much water is retained. d) Wet the soil and feel the texture. 9) Students wanted to test out the capacity to retain water. They poured water through the soil samples and waited for 2 minutes. Based on the results, which of the following is a correct conclusion? a) Water seeped through sample A the slowest b) Sample A retained the most water c) Water seeped through sample B the fastest d) All samples retained the same amount of water 10) A gardener wants to add humus to his soil because it contains a lot of nutrients and helps retain water. What does humus form from? a) sand b) decayed organisms c) rocks and minerals d) volcanic lava

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