CK-12 Foundation is a non-profit organization with a mission to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide. Using an open-source, collaborative, and web-based compilation model, CK-12 pioneers and promote
URL: http://www.ck12.org/flx/render/embeddedobject/116516 ... Fertilizers that run off of lawns and farm fields are extremely harmful to the environment.
c. large ships. d. land. 4. Which statement is false about the April, 2010 explosion of the Deepwater Horizon drilling rig? a. It caused the largest oil spill to date. b.
Jun 26, 2015 - Explain how fertilizer in runoff leads to algal blooms and dead zones. â¢ Give examples of point-source pollution, and define thermal pollution. â¢ Describe how the ocean is being polluted with trash and why ocean water is becoming m
Every year dead zones appear in lakes and nearshore waters. A dead zone is an area of hundreds of kilometers of ocean without fish or plant life (Figure 1.4). FIGURE 1.4. The Gulf of Mexico dead zone is created by the Mississippi River, which carries
countries every year. Sources of Water Pollution. Water pollution contributes to water shortages by making some water sources unavailable for use. In underdeveloped ... water contamination in developing countries is raw sewage. ... Oil and other petr
Explain how fertilizer in runoff leads to algal blooms and dead zones. â¢ Give examples of point-source pollution, and define thermal pollution. â¢ Describe how the ocean is being polluted with trash and why ocean water is becoming more acidic. Les
Apr 27, 2015 - b. too many algae. c. dead zones. d. two of the above. 4. Bacteria are most likely to contaminate water if it is polluted by a(n) a. oil refinery. b. chemical plant. c. nuclear power plant. d. sewage treatment plant. 5. Nuclear power p
come from a wide spread area such as run-off from roads, lawns, farms and cities. ... URL below. URL: http://www.ck12.org/flx/render/embeddedobject/60939. 2 ...
14. 6 and 7. 15. 7 and 8. 16. 8 and 9. 17. 8 and 9. 18. 10 and 11 19. 2 and 3. 20. 3 and 4. 9.2. Evaluation of Perfect Square Roots. Answers. 1. 6. 2. 7. 3. 8. 4. 9. 5. 10. 6. 11. 7. 12. 8. 14. 9. 20. 10. 30. 11. 100. 12. 15 ... 11. 13.6. 12. 12.04.
exercises with which students can practice their new vocabulary words ..... The definitions given below for the vocabulary words are incorrect. Rewrite ...... Spanish Exploration and Conquest. Draw a line to match each word on the left with its defin
15. 16. Identity property of multiplication. 17. Commutative property of addition. 18. Inverse property of addition. 19. Associative property of multiplication. 20. Associative property of addition. 21. Identity property of addition. 22. 23. 24. 25.
Pearson Education, Inc., publishing as Pearson Prentice Hall. All rights reserved. 174. ANSWER KEY. Chapter 4 Test A. 1. d. 2. c. 3. a. 4. b. 5. d. 6. a. 7. b. 8. c. 9. d ... itself can be used to kill cancer cells. Energy from radioactive decay can
6. Choice D is correct. Simón Bolívar's beliefs as a revolu- tionary were profoundly influenced by the Enlightenment philosophies of Locke and Rousseau.
13) A warehouse placed 2 equal weight boxes on a scale. Total they weighed 4 pounds. Each box weighed ____ of a pound. 14) A movie theater went through 3 pounds of popcorn every 5 hours. They went through ____ of a pound every hour. 15) A lumber comp
Chapter 7 â Multiplication and Division of Fractions. Answer Key. CK-12 Middle School Math Concepts - Grade 6. 1. 7.1. Multiplication of Fractions by Whole Numbers. Answers. 1. 3. 2. 8. 3. 13. 4. 8. 5. 6. 6. 7. 7. 12. 8. 10. 9. 5. 10. 7. 11. 4. 12.
class room floor. The force of friction on the box is directed toward the. ANSWER: (1) left. 128. The diagram below shows a sled and rider sliding down a snow-covered hill that makes an angle of 30.Â° with the horizontal. Which vector best represents
Chapter 11 â Using Probability. Answer Key. CKâ12 Middle School Math Concepts â Grade 8. 1. 11.1. Using Tree Diagrams. Answers. 1. 6. 2. 9. 3. 12. 4. 8. 5. 18. 6. 12. 7. 15. 8. 18. 9. 24. 10. 24. 11. 18. 12. 18. 13. 36. 14. 36. 15. 48. 11.2. Ca
Chapter 8 â Ratios, Proportions, and Percents. Answer Key. Middle School Math Concepts - Grade 6. 3. 8.5 Comparison of Unit Rates. Answers. 1. 7/1. 2. 16/1. 3. 6/1. 4. 5/1. 5. 5/1. 6. 25/1. 7. 30/1. 8. Â½. 9. 6/1. 10. 24/1. 11. 4/1. 12. 12/1. 13. 3
length for male widowbirds. What type of selection is shown by these data? Shortened. Control 1. Control 2. Lengthened. A verage nests per male bird. Tail feather treatment. 0.0. 0.5. 1.0. 1.5. 2.0. FIG. 11.2 a. sexual b. disruptive c. stabilizing d.
Answers. 1. Yes, Î DEF â Î HJI , SSS ... Definition of a Midpoint. 3. .... DBC â â DBA because they are both right angles and created by perpendicular lines. 5.
Prior Knowledge Questions (Do these BEFORE using the Gizmo.) [Note: The purpose of these questions is to activate prior knowledge and get students thinking. Students are not expected to know the answers to the Prior Knowledge Questions.] 1. Water pollution is the addition of harmful substances to water. Some of these substances are found at home. What household chemicals might be harmful if not disposed of properly? Answers will vary. [Examples could include paint, paint thinner, weed killer, insecticide, batteries, and motor oil.]
2. What are some other causes of water pollution? Answers will vary. Gizmo Warm-up The Water Pollution Gizmo™ will teach you about some of the main kinds of water pollution. On the TYPE tab, under Types of pollution, check that Toxic is selected. Read the paragraphs on the right and bottom of the Gizmo. 1. What is toxic pollution? Toxic pollution is contamination of water by materials that cause death, disease, or birth defects.
2. What are some examples of toxic pollutants listed in the Gizmo? Paints, gas, battery acid, mercury, pesticides
3. Can you think of other examples of toxic substances, not listed in the Gizmo? Answers will vary. [There are many toxic substances. These include industrial chemicals, radioactive nuclear waste, heavy metals, PCBs, etc.]
Activity A: Types of water pollution
Get the Gizmo ready: Check that the TYPE tab and Toxic pollution are selected.
Question: What are the main types of water pollution? 1. Read and learn: Besides toxic pollution, the other types of pollution are sediment pollution, nutrient pollution, and bacterial pollution. You have already described toxic pollution on the previous page. Read about the other types, and describe each in your own words.
Sediment pollution Description:
Pollution by sand, soil, and other minerals that are washed into streams and rivers after rainfall.
Caused by careless farming, mining, and building activities
Destruction of fish and wildlife habitat, clouds water (blocking sunlight needed by aquatic plants), and piles up in reservoirs, rivers, and harbors.
Nutrient pollution Description:
Contamination of water by excessive nutrients, usually nitrogen and phosphorus.
Fertilizer, manure, and human waste
Excessive algae reduce sunlight passing through water. [Algal blooms can also deplete oxygen levels, killing fish and other organisms.]
Bacterial pollution Description:
Contamination of water by bacteria.
Manure, human waste, and spoiled food.
Human, animal, and plant health problems. [Some types of bacteria aid in pollution control by breaking down organic matter.]
Get the Gizmo ready:
Select the EXAMPLE tab. Check that example 1/12 is selected. (If not, use the arrow buttons to get to example 1/12.)
Question: What are the real-world causes of water pollution? 1. Practice: For each Real-world example presented in the Gizmo, guess which type or types of pollution will result by checking the boxes. When you are ready, click Check answer to see if you were right. Read the explanation, and then use your own words to fill in the table. Example
Chicken manure contains high levels of bacteria and nitrogen.
Car gases and leaking fluids cause toxic pollution. Nitrogen oxide in exhaust causes nutrient problems.
Pesticides can enter the water supply through runoff or seepage through the soil.
After trees are removed, exposed soil will erode into streams and rivers.
Oil and antifreeze are toxic chemicals that will wash into local waterways after being dumped in the alleyway.
Removal of trees and shrubs will expose soil that can be washed into the lake.
Paint and paint thinner are toxic substances that will leach into groundwater at the landfill.
The sewage treatment plant will not be able to treat all the water, so some untreated water will be released into the environment.
Paper products are made from trees. Logging exposes soil and leads to sediment pollution.
Oil and other fluids will wash off the parking lot into the stream. Construction will cause soil erosion.
Plants can’t use all of the fertilizer. Excess fertilizer will be washed into the environment, causing nutrient pollution.
Human waste is leaking from the septic tank. This is a source of nutrients and bacteria.
(Activity B continued on next page)
Activity B (continued from previous page) 2. Practice: Classify each of the following examples as toxic, sediment, nutrient, and/or bacterial pollution. Explain your classifications. A. Logging removes trees from a hill, leaving a barren landscape. Classification: Sediment pollution Explanation: Without tree roots to hold it in place, soil will be washed into streams and rivers.
B. A man washes clothes in a stream using a detergent that contains phosphorus. Classification: Nutrient pollution Explanation: Phosphorus is a nutrient that can cause harmful algal blooms.
C. At an old gas station, gasoline leaks from an underground storage tank. Classification: Toxic pollution Explanation: Gasoline is a harmful chemical.
D. At a research lab, a scientist carelessly pours cultures of living microbes down the drain. Classification: Bacterial pollution Explanation: Living microbes can cause disease or infection.
3. Think and discuss: Many sources of water pollution are found within the home. What actions can you take to reduce water pollution? Answers will vary. Sample answer: To reduce water pollution, I can properly dispose of harmful chemicals such as paint, paint thinner, oil, pesticides, and cleaning solvents. (Most landfills have a special facility for handling chemicals.) I should not use excessive amounts of fertilizer on my lawn and garden. I should check below the car to make sure it is not leaking oil or antifreeze.