Help
Options
Question
Within the dull-colored rocks that cover the earth lie small deposits of igneous and metamorphic crystals called __________
click to flip
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't know
Question
When cut and polished crystals gain a brilliance that can last for centuries. Because of their beauty,cut gemstones, or _____,have been used as a symbol of wealth and power by rulers in almost every civilization.
Remaining cards (42)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
6th sc-ch3 cc7
6th. Science ch,3
| Question | Answer |
|---|---|
| Within the dull-colored rocks that cover the earth lie small deposits of igneous and metamorphic crystals called __________ | gemstones |
| When cut and polished crystals gain a brilliance that can last for centuries. Because of their beauty,cut gemstones, or _____,have been used as a symbol of wealth and power by rulers in almost every civilization. | gems |
| The rarest, most durable and beautiful gems are considered ______ ______ | precious stones |
| The _______, which is hard, crystalline form of carbon, is the hardest of all known minerals. | diamond |
| What is one important fact about the diamond? | it is the hardest of all known minerals |
| Most diamonds used as gems,are mined from minerals deposits in Brazil, India, and South Africa. These deposits are usually found in deep tubelike formations known as _________ ________ that appear to be the clogged vents of extinct volcanoes. | diamond pipes |
| Although the common, opaque(not transparent) form of the minerals _________,also called emery, is not particularly valuable,two colored forms of corundum are highly valued as precious stones. | corundum (ku run dum) |
| When pure corundum contains traces of the metal ______,the resulting transparent red stone is called ruby. | chromium |
| When pure corundum contains traces of the metal chromium,the resulting transparent red stone is called _______. | ruby |
| When corundum contains traces of _______ or _______ instead of chromium, it may have a blue,yellow,orange,or even purple color and is known as sapphire. | iron and titanium(ti ta ne um) |
| When corundum contains traces of iron or titanium(ti ta ne um) instead of chromium, it may have a blue,yellow,orange,or even purple color and is known as ________. | sapphire |
| Different forms of the mineral ______ are also priced as gems. | beryl |
| The most famous form of beryl is the deep green _________. | emerald |
| Gems that are not rare or as durable as precious stones are called ______ ______ | semiprecious stones |
| The most famous form of beryl is the deep green emerald. The beautiful green color results from traces of ______. | chromium |
| One semiprecious stone commonly confused with ruby is ______ ______ | red spinel (spi nel) |
| One famous red spinel, known as the "_____ ______ ________," is the central stone in the British Imperial State Crown | "Black Prince's Ruby" |
| Other beautiful semiprecious stones include? Name 7. | 1.purple amethyst , 2.green yellow,or blue zircon 3.multi-colored tourmaline(toor mu lin), 4.deep blue lapis lazuli(lap is laz u le), 5.blue-green turquoise, 6.milky gray chalcedony kal sed 'n e),and 7.green jade |
| 1.deep blue lapis lazuli (lap is laz u le), 2.blue-green turquoise, 3.milky gray chalcedony (kal sed 'n e),and 4.green jade What are special about these 4 stones. | they have been favorites of craftsmen who have used them throughout history to carve objects of lasting beauty |
| Among many minerals in rocks are _______ such as gold,silver,copper,iron,and aluminum | metals |
| Among many minerals in rocks are metals such_______, ________ ,_________,_________,__________ _________ | gold,silver,copper,iron,and aluminum |
| Metals, in their natural state, are mixed with other minerals. Any rock containing a metal together with ________ is called an ore. Pure metal is obtained by mining an ore and then by removing the _______ by heat or chemical processes. | impurities and impurities |
| Metals, in their natural state, are mixed with other minerals. Any rock containing a metal together with impurities is called an ____. Pure metal is obtained by mining an _____ and then by removing the impurities by heat or chemical processes. | ore and ore |
| Like ________ stones, ________ ________ are known for their durability,rarity,and beauty | precious and precious metals |
| What are precious metals known for? (3 things) | their durability,rarity,and beauty |
| The precious metal _______ has been valued by man since earliest times (see Gen.2:12) ______ is often mixed with other metals- such as silver,nickle,platinum,or copper-which increases its strength or alter its color | gold and gold |
| Although the precious metal _________ has been known since ancient times, it was only the 1700s that it was discovered by Europeans. | platinum(plat i num) |
| Although the precious metal platinum(plat i num) has been known since ancient times, it was only the ______ that it was discovered by ________. | 1700s and Europeans |
| In recent years, ____________ has become much more expensive than _______ because of its rarity and its many uses | platinum(plat i num) and gold |
| _______,another precious metal,has been used for centuries to make jewelry,fancy trays,silverware, and other items that display its lustrous beauty | Silver |
| Silver has been used to make what? (3 things) | jewelry,fancy trays,silverware, and other items that display its lustrous beauty |
| One very practical metal,______,has been fashioned into weapons and tools for thousands of years. | iron |
| Because it is strongly abundantly available, iron(steel)is ______ _______ _______ ________ ______ | the most commonly used metal |
| Some of these iron products are made of ______ ______, | cast iron |
| However,most iron products are in the form of _______,an alloy (al oi: mixture of metals) of iron and carbon. | steel |
| A rust-resistant type of steel called ________ __________ is an alloy (al oi: mixture of metals) of iron,chromium,and nickle. | stainless steel |
| What is a alloy(al oi)? | mixture of metals |
| _______,the reddish-orange metal that covers a penny,is a good conductor of electricity and is easy to shape into thin strands. | Copper |
| Two alloys containing copper are _______ (made of copper and zinc) and ______(made from copper and tin). | brass and bronze |
| Two alloys containing copper are brass (made of _______ _______ _______) and bronze(made from _______ _______ _______). | copper and zinc;copper and tin |
| An important substitute for steel and copper is a silver-colored metal known as ________. | aluminum |
| Other important metals include _______,an ingredient in stainless steel and rechargeable batteries;_______,used to make batteries and to protect steel from rusting;and ________,used as a fuel for nuclear power plants,naval ships,and submarines. | nickle,zinc,and uranium |
| What are three precious metals? | gold,silver,and platinum |
Created by:
nelsonclan