Junior ScienceB.H. Sanborn, 1921 - 533 σελίδες |
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Σελίδα ix
... moon . - What are comets and meteors ? Exercises . CHAPTER XII 77 95 Force and Energy What holds the solar system together ? 112 • Why does a body have weight ? In what direction does the earth pull ? Why does a body float ? Can a body ...
... moon . - What are comets and meteors ? Exercises . CHAPTER XII 77 95 Force and Energy What holds the solar system together ? 112 • Why does a body have weight ? In what direction does the earth pull ? Why does a body float ? Can a body ...
Σελίδα 4
... moon , " that is , when the moon is between the sun and the earth ( cf. § 92 ) . So they decided that it is the moon , not a beast or spirit , that sometimes comes exactly between us and the sun . We have all read how men made fun of ...
... moon , " that is , when the moon is between the sun and the earth ( cf. § 92 ) . So they decided that it is the moon , not a beast or spirit , that sometimes comes exactly between us and the sun . We have all read how men made fun of ...
Σελίδα 3
... 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 sun and the moon , what lightning is , how soil is formed , why grass is green , how ...
... 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 sun and the moon , what lightning is , how soil is formed , why grass is green , how ...
Σελίδα 4
... moon , " that is , when the moon is between the sun and the earth ( cf. § 92 ) . So they decided that it is the moon , not a beast or spirit , that sometimes comes exactly between us and the sun . 66 " " We have all read how men made ...
... moon , " that is , when the moon is between the sun and the earth ( cf. § 92 ) . So they decided that it is the moon , not a beast or spirit , that sometimes comes exactly between us and the sun . 66 " " We have all read how men made ...
Σελίδα 9
... moon ? is the moon from the earth ? ( Consult Chapter XI . ) How far 3. Make a list of some of the great inventions , with their dates and the names of the inventors . 4. Name some of the important scientific discoveries of the last ...
... moon ? is the moon from the earth ? ( Consult Chapter XI . ) How far 3. Make a list of some of the great inventions , with their dates and the names of the inventors . 4. Name some of the important scientific discoveries of the last ...
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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.