原版英语RAZ 教案Gems - Treasures from the Earth_CQ (2).pdf

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1、 Learning AZ All rights reserved.www.readinga-Quick CheckLEVELInstructions:Read each question carefully and choose the best answer.Name Date Quick Check continued on following pageV V1.Why do rare gems cost a great amount of money?A They are rare.B Mining them is often done by hand.C They are only f

2、ound deep within the earth.D All of the above 2.Where are most crystals formed?A on the slopes of volcanoesB deep within the earth C in rivers in AfricaD all of the above 3.How are crystals and organic gems different?A Crystals are minerals,and organic gems come from living things.B Crystals are fou

3、nd near the surface of the earth,and organic gems come from deep within the earth.C Crystals are skeletons of tiny sea creatures,and organic gems are mixed minerals with strict shapes.D Crystals are used in jewelry,and organic gems are used on tools.4.What are atoms?A types of gems created from crys

4、talsB very small particles that make up all things on Earth C certain types of gems found only in South AmericaD types of sea creatures that form coral reefsGems:Treasures From the Earth Learning AZ All rights reserved.www.readinga-Quick Check(continued)LEVELName Date Quick Check continued on follow

5、ing pageV VGems:Treasures From the Earth5.Why is it important for a gem in a ring to be high on the Mohs scale?A so it will have a purer colorB so it will not have any streaks or grainC so it will not be damaged during wear D so it will be closer to a diamond on the scale6.How is a gem valued?A by w

6、here it was minedB by how many facets it containsC by how hard it was to locate and mineD by its cut,carat,color,and clarity 7.What is not true about natural pearls?A They can take years to form.B They are perfectly round.C They are an organic gemstone.D They form inside oysters from a grain of sand

7、.8.Which of the following includes an opinion?A The most valuable quartz is a stone called opal.B Blue-green turquoise often has pretty spots and streaks running through it.C Gem-quality emeralds are rare and usually small.D Quartz is found all over the world,in all colors of the rainbow.9.What type

8、 of gem is formed when a mineral is squeezed under layers of rock?A diamond B emeraldC pearl D opal10.Which of the following is not a crystal?A a diamondB a pearlC a sapphireD an opal Learning AZ All rights reserved.www.readinga-Quick Check(continued)LEVELName Date V VGems:Treasures From the Earth11

9、.Extended Response:Explain how creating gems in a lab can benefit people and the environment.12.Extended Response:How do gems,such as crystals,sapphires,and opals form differently from each other?Learning AZ All rights reserved.www.readinga-Quick Check Answer SheetLEVELV VMain Comprehension Skill:Ca

10、use and EffectGems:Treasures From the Earth 1.D Cause and Effect 2.B Main Idea and Details 3.A Compare and Contrast 4.B Vocabulary 5.C Make Inferences/Draw Conclusions 6.D Main Idea and Details 7.B Main Idea and Details 8.B Fact or Opinion 9.A Cause and Effect 10.B Vocabulary 11.Answers will vary so

11、mewhat but should include the following:strip mining,which is used to find gems,destroys huge areas of land;people have been killed mining gems;and because they are rare,people have died trying to get them.12.Answers should include the following:Crystals:minerals squeezed under layers of rocks,squee

12、zing forces atoms to arrange themselves in the smallest shape possible.Sapphires:minerals get so hot inside the earth that they melt;as they slowly cool,the atoms form a regular crystal pattern.Opals:minerals dissolve in water;as the water evaporates very slowly,the minerals left behind form a crystal.