原版英语RAZ 教案S10-Gems Treasures from the Earth.pdf

《原版英语RAZ 教案S10-Gems Treasures from the Earth.pdf》由会员分享，可在线阅读，更多相关《原版英语RAZ 教案S10-Gems Treasures from the Earth.pdf（4页珍藏版）》请在淘文阁 - 分享文档赚钱的网站上搜索。

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 pageS S1.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 above3.How are crystals and organic gems different?A Crystals are minerals,and organic gems come from living things.B Crystals are foun

3、d 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 cryst

4、alsB very small particles that make up all things on EarthC 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 followin

5、g pageS SGems: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 whe

6、re 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.8

7、.Which of the following states 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 of

8、gem is formed when a mineral is squeezed under layers of rock?A diamondB emeraldC pearlD 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 S S11.Extended Response:Explain how gems

9、 created in labs can benefit people and the environment.12.Extended Response:How do gems,such as crystals,sapphires,and opals,form differently from each other?Gems:Treasures from the Earth Learning AZ All rights reserved.www.readinga-Quick Check Answer SheetLEVELS SMain Comprehension Skill:Cause and

10、 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 somewhat

11、but should include the following:to find gems,strip mining 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 information:crystals minerals are squeezed under layers of rocks;squeezing

12、forces the atoms to arrange themselves in the smallest shape possible;sapphires minerals get so hot inside the earth that it melts 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.