By US Environmental Protection Agency
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Additional resources for America's Children and the Environment
2. Put the soil in a quart jar or similar container that has a lid. 3. Fill the container with water and add 1 teaspoon of dishwashing liquid. 4. Put the lid on tightly and shake the container. 5. After 1 min, measure and record the depth of sand that settled on the bottom. 6. After 2 h, measure and record the depth of silt that settles on top of the sand. 7. After 24 h, measure and record the depth of the layer between the silt and the floating organic matter. Soil is a mixture of mineral and rock particles, the remains of dead organisms, water, and air.
Which of the following is an example of a community? A. all the white-tailed deer in a forest B. all the trees, soil, and water in a forest C. all the plants and animals in a wetland D. all the cattails in a wetland 433-CR-MSS05-LBE 8/19/04 10:47 PM Page 33 Record your answers on the answer sheet provided by your teacher or on a sheet of paper. Use the graph below to answer question 11. Mouse Population Exposed to Predators 80 Population A Population B Population 70 60 50 40 30 20 Record your answers on a sheet of paper.
10 0 2 4 6 8 10 12 14 16 18 20 22 Breeding season 11. The graph depicts the growth of two white-footed mice populations, one exposed to hawks (population A) and one without hawks (population B). Are hawks a limiting factor for either mouse population? If not, then what other factor could be a limiting factor for that population? 12. Diagram the flow of energy through an ecosystem. Include the sources of energy, producers, consumers, and decomposers in the ecosystem. Understand the Question Be sure you understand the question before you read the answer choices.