�! � Possible answers include: red, hard, rough gravelly surface, rectangular solid 7. They are the groups of atoms with their magnetic fields all pointing in the same direction. Skill Practice 23. all students Assessment. 3. T 15. Section 2 (page 74) 1. losing 2. positive 3. protons 4. electrons 5. gains 6. negative 7. ionic 8. regular 9. electrons 10. molecules 11. ions 12. nonpolar 13. covalent 14. polar 15. covalent 16. Darwin 3. mutations 4. punctuated equilibrium 5. does 6. are not 7. differences 8. can 9. were 10. Rutherford�s model had a nucleus; Thomson�s had the electrons imbedded in the positively charged material. 4. If the core is massive enough, it could collapse and become a black hole. Because they vary widely in their chemical composition and structure. Accuracy (3/1) 5. (2/1) 4. Color (3/2) 13. gained or released (4/2) 14. gas or solid (3/2) 15. mass, law of conservation of mass (4/2) 16. physical (4/2) 17. physical (4/2) 18. chemical (4/2) 19. physical (4/2) 20. chemical (4/2) 21. physical (4/2) 22. chemical (4/2) 23. chemical (4/2) 24. Section 2 (page 59) 1. isotope 2. atomic number 3. mass number 4. average atomic mass 5. nucleus 6. archaeologist 7. transmutation 8. americium 9. alpha particle 10. half-life 11. beta particle 12. radioactive decay 13. thyroid 14. strong nuclear Key Terms (page 60) Chapter Review Part A. N (north); the filings between the poles of each magnet are repelled, so the poles must be like poles. Answers will vary but should demonstrate an understanding of the need to experiment and examine data and conditions carefully. Molecules throughout the water press against each other, transmitting the pressure unchanged throughout the fluid. An alpha particle consists of two protons and two neutrons. U (2/1) 4. 7. Characteristics that parents developed during their lives were passed to their offspring. (3/1) 6. Students should draw a box around the Actinides. Fossils give proof of preexisting, simpler life forms and their environment. 14 cm (1/1) 3. line (8/3) 4. The force necessary to move the space shuttle is equal to its mass times its acceleration. (3/2) Part B. Directions: Answer each question or respond to each statement in the space provided. 3. 2. true 3. true 4. false; Metals have the properties of conductivity, magnetism, and malleability. question 1 of 3 Plate tectonics is the theory that the Earth's _____ is broken into pieces that move around on top of the _____. Key Concept Builder Date Class LESSON 2 Energy Transfer in the Atmosphere Key Concept How does energy transfer from the Sun to Earth and the atmosphere? Draw two different orbits that Earth has had over about 100,000 years. 5. Individuals with traits most favorable for a specific environment survive and pass on these traits to offspring. Possible uses: cleaner, disinfectant, fertilizer, refrigerant, to freeze-dry foods 7. Moon, Earth b. The size of the paddle could be larger, or more paddles could be used. Tracer elements are also used by scientific laboratories to study environmental conditions. (1/1) 9. No. No c. Yes d. No Section 2 (page 82) Directed Reading for Content Mastery Overview (page 83) 1. reactant 2. endothermic 3. heat energy 4. heat energy 5. rate of reaction 6�8. Water moves up from roots into leaves, and food moves down from leaves to other plant parts. (5/2) 13. Bob the builder lives alone in a little house which is comfortably messy. student’s proficiency level. 2. Archaeologists use carbon dating to determine the age of dead animals, plants, and humans. color, odor (For grouped answers, order of answers will vary.) Measure the line with a ruler marked in millimeters. Radioactive decay is the release of nuclear particles and energy. 6/3 12. 7 2. d. How often does it erupt? DDT ended up in the food the pelicans ate. (2/1) 17. 8. Key Concept How does photosynthesis affect the carbon cycle? Living things grow and develop. Earth�s poles 8. attraction 9. magnetite 10. domains Sections 2 (page 123) 1. d 2. b 3. g 4. a 5. f 6. c 7. e 8. converts electric energy into kinetic energy 9. uses a magnetic field to turn motion into electricity 10. changes the voltage of an alternating current with little loss of energy Key Terms (page 124) 1. magnetic domain 2. magnetic field 3. magnetism 4. compass 5. electromagnet 6. electric motor 7. aurora 8. magnetosphere 9. electric generator 10. transformer 11. alternating current Chapter Review Part A. Matter and Energy in Ecosystems. Define In your own words, write a definition of the water cycle. How high can it jump? 7. transition 8. 7. Worksheets are 3 cycles of matter work answer key, 3 cycles of matter work answers, 3 cycles of matter work answers, Blue skies, Cycle of matter work, Cycles work, Phases of matter multiple choice quiz, Chapter 12 matter and energy in the environment. 7. In a polar bond, electrons are shared unequally. (2/2) 11. Answers may vary, but should include that an introduced species may use up all of the resources needed by native species. 11. neutralization Directed Reading for Content Mastery Overview (page 93) 1. heterogeneous 2. homogeneous 3. molecular level 4. solute 5. solvent 6. substance that dissolves 7. solution 8. solute 9. solvent Section 1 and 2 (page 94) 1. They come in many forms. Answers will vary. 11. 9. 5. the poles 6. iron 7. A scientist works to learn more scientific information and an engineer applies scientific information to solve a problem or human need. 2. We have seasons because Earth�s axis is tilted. Possible answers include: yellow paint, wood interior, solid, graphite core, 2�3 g 9. 9. Companies apply for a patent for a new product or invention. This joining of atoms is called fusion, and it changes matter to the energy that powers the star. Answers will vary, but should mention Earth�s rotation and that the Sun�s light falls on only half of Earth at one time. F 9. Key Concept Why is Earth warmer at the equator and colder at the poles? If you don't see any interesting for you, use our search form on bottom ↓ . Vocabulary Review (page 25) 1. threatened (3/1) 2. biodiversity (2/1) 3. captive population (2/2) 4. extinct (3/1) 5. conservation biology (4/2) 6. acid rain (3/1) 7. endangered (3/1) 8. reintroduction (6/2) 9. ozone depletion (3/1) 10. introduced (5/2) 11. native (2/1) 12. restoration (5/2) 13. extinct (3/2) 14. endangered (3/2) 15. threatened (3/2) Part B. Name Date Class Chapter 20 LESSON 2 key Concept • How does matter move in ecosystems car pushes back causing. 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