Junior ScienceB.H. Sanborn, 1921 - 533 σελίδες |
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Σελίδα xiii
... produce heat and light ? How does a dynamo produce a current ? How does electricity produce motion ? - Exercises and summary . The Light of Day CHAPTER XXVI - Why can we see objects ? How does sunlight travel ? How does a mirror change ...
... produce heat and light ? How does a dynamo produce a current ? How does electricity produce motion ? - Exercises and summary . The Light of Day CHAPTER XXVI - Why can we see objects ? How does sunlight travel ? How does a mirror change ...
Σελίδα 3
... produce seeds , why dew is formed , why milk sours , why yeast raises bread , why the moon grows and wanes , why the sun gives off heat ? Did you ever wonder what fire , sound , light , and electricity are , why we have eclipses of the ...
... produce seeds , why dew is formed , why milk sours , why yeast raises bread , why the moon grows and wanes , why the sun gives off heat ? Did you ever wonder what fire , sound , light , and electricity are , why we have eclipses of the ...
Σελίδα 20
... producing " ground glass . " The sand particles chip the sur- face . The wind of a sandy desert is a natural sand blast ; it not only roughens window glass , but wears away the surface of rocks ( cf. § 151 ) . 15. Exercises . - 1. Is it ...
... producing " ground glass . " The sand particles chip the sur- face . The wind of a sandy desert is a natural sand blast ; it not only roughens window glass , but wears away the surface of rocks ( cf. § 151 ) . 15. Exercises . - 1. Is it ...
Σελίδα 26
... produce the steam of the locomotive and steam- ship . Then , too , we think of the joyous bonfire of our celebrations and of the camp fire over which we cook our picnic meal . It is true that fire destroys many precious lives every year ...
... produce the steam of the locomotive and steam- ship . Then , too , we think of the joyous bonfire of our celebrations and of the camp fire over which we cook our picnic meal . It is true that fire destroys many precious lives every year ...
Σελίδα 27
... produced hot sparks . They caught the sparks in some tinder and thus set the tinder on fire . We often see such sparks when a horse's hoofs strike a stone pavement . The tinder consisted of dried moss , bark , pitch , or some other ...
... produced hot sparks . They caught the sparks in some tinder and thus set the tinder on fire . We often see such sparks when a horse's hoofs strike a stone pavement . The tinder consisted of dried moss , bark , pitch , or some other ...
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
acid ammonia animals bacteria becomes blood body boiling bones bottle breathing bulb burning called candle carbon dioxide carry cause cells cerebrum changed cloth coal cold color cool copper covered digestive dish dry cell earth electric current epidermis evaporate feet fire flame force give glass grow heat hydrochloric acid hydrogen inside iron kerosene kerosene lamp lamp layers learned light rays limewater liquid lungs machine magnet manganese dioxide material melted metal milk moon mouth move muscles needle nerve nitrogen nonconductor object oxide oxygen pass phosphorus piece pipes plants pole potassium chlorate pounds pressure produce pull pump push rock rubbed sal ammoniac salt seeds skin soil solution starch steam stomata stove substances sugar sulphur sunlight surface temperature tissue trees tube vibrations warm weather weight wind wire wood yeast zinc
Δημοφιλή αποσπάσματα
Σελίδα 509 - Measures of Weight 10 milligrams (mg) =1 centigram eg 10 centigrams =1 decigram dg 10 decigrams =1 gram g 10 grams =1 dekagram Dg 10 dekagrams =1 hektogram Hg 10 hektograms =1 kilogram Kg...
Σελίδα 402 - THIS is the forest primeval. The murmuring pines and the hemlocks, Bearded with moss, and in garments green, indistinct in the twilight, Stand like Druids of old, with voices sad and prophetic, Stand like harpers hoar, with beards that rest on their bosoms...
Σελίδα 509 - Measures of Length 10 millimeters (mm.) . . . . =1 centimeter cm. 10 centimeters =1 decimeter dm: 10 decimeters =1 meter m. 10 meters =1 dekameter Dm. 10 dekameters =1 hektometer Hm. 10 hektometers =1 kilometer Km.
Σελίδα 509 - Area. 100 square millimeters (sq. mm.) =1 sq. centimeter (sq. cm.). 100 square centimeters = 1 sq. decimeter (sq. dm.). 100 square decimeters =1 sq. meter (sq. m.). 3. Cubic Measure, or Volume. The unit of volume is the liter, which is 1 cu. dm., or 1,000 cc 1,000 cubic millimeters (cu. mm.) = 1 cubic centimeter (cc). 1,000 cubic centimeters =1 cubic decimeter (cu. dm.). 1 cubic decimeter = 1 liter (1.). 10 liters =1 dekaliter (dl.). 10 dekaliters =1 hectoliter (hl.). 10 hectoliters = 1 kiloliter...
Σελίδα 105 - The known principal planets, in order of their distance from the Sun are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
Σελίδα 339 - Levers are divided into three classes: in the first class, the fulcrum ' is between the power and the weight ; in the second class, the fulcrum is...
Σελίδα 86 - The wind arrows show the wind to be moving in a direction opposite to the movement of the hands of a watch (counterclockwise) when it is laid, face up, on the map.
Σελίδα 243 - ... north pole of one magnet will attract the south pole of another, and the south pole of one will attract the north of another ; but the north...
Σελίδα 53 - The oxygen is carried by the blood to all parts of the body...
Σελίδα 331 - In the second class of levers th'e fulcrum is at one end and the power at the other, with the weight between them.