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Dorling Kindersley Science Encyclopedia Work/Review Sheets

CRYSTALS

Read each question and circle the letter of the best answer.
NOTE: Some questions may have more than one "correct" answer - think carefully about what you have read, and choose the most complete one.

1.What do gems such as rubies and sapphires have in common with regular old household sugar?
A) they are all very costly. B) they are all sweet. C) they are all crystals. D) A, B & C.

2.Most solids, including metals, are made up of what?
A) lots of crystals. B) sugar. C) iron. D) A, B & C.

3.You can often see crystals in rocks. They sometimes seem to have no definite shape. Why?
A) because they are cheap. B) because they are packed together. C) because they have been smashed. D) A, B & C.

4.How many different main shapes (or "systems") of crystals are there?
A) a few. B) 7. C) too many to list. D) A, B & C.

5.These shapes reflect what?
A) the crystal lattice. B) the arrangement of the atoms or ions that the crystal is made of. C) symmetry. D) A, B & C.

6.What does the term "LCD" stand for?
A) lightly charged diodes. B) light condensing diode. C) liquid crystal display. D) A, B & C.

7.William Henry Bragg and his son found that if a beam of X-ray is passed through a crystal it does what?
A) reveals the inner structure. B) makes a pattern on a photographic plate. C) makes a "crystallogram". D) A, B & C.

8.What is the name given to the way crystals split along certain planes?
A) breakage. B) lineage. C) cleavage. D) A, B & C.

9.What happens when crystals are allowed to form in a free space, such as rock cavities?
A) They form more regular shapes. B) they are more beautiful. C) they are more likely recognizable. D) A, B & C.

10.What causes the coloration of quartz crystals?
A) food coloring. B) impurities. C) light waves. D) A, B & C.

11.How can you make your own crystals?
A) by hanging a string in water with a lot of sugar or bath salts dissolved in it. B) by putting rocks in water. C) by leaving two crystals together for a while in the dark. D) A, B & C.

12.What examples of crystals can you recognize?
A) snow flakes B) frost C) ice cubes D) A, B, & C.

What more can you say about MATTER now?________________________________________________________________________________
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TRY THIS RELATED ACTIVITY: ROCK CANDY Matter09 Š1999-2000 Sassafrass Grove Homeschool

NOTE: These work/review/related-activity sheets are for use with the DK Science Encyclopedia as a 12 part science study. The first portion of the initial section, "Matter" is presented here. More will be added as time permits. If you find errors or see need for additions, please contact us at the e-mail address provided at the bottom of this page.

This site and these worksheets are in no way associated with nor endorsed by Dorling Kindersley.

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