Junior ScienceB.H. Sanborn, 1921 - 533 σελίδες |
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Σελίδα xv
... fruit ? Exercises and summary . Our Plant Friends and Foes —— CHAPTER XXXIII How are trees our friends ? How does a tree get its shape ? What is the inside of a tree like ? What are sapwood and heartwood ? How are trees cut into lumber ...
... fruit ? Exercises and summary . Our Plant Friends and Foes —— CHAPTER XXXIII How are trees our friends ? How does a tree get its shape ? What is the inside of a tree like ? What are sapwood and heartwood ? How are trees cut into lumber ...
Σελίδα 7
... fruit ; to science the up - to - date city house and school building owe their cleanliness , light , fresh air , and con- veniences . We should study science , then , not merely to " observe phenomena , " but to understand the ways of ...
... fruit ; to science the up - to - date city house and school building owe their cleanliness , light , fresh air , and con- veniences . We should study science , then , not merely to " observe phenomena , " but to understand the ways of ...
Σελίδα 31
... fruit jar and a shallow pan containing water . The phosphorus is put on a holder that reaches about halfway up the jar . The holder may be a strip of " tin " with a horizontal top about the size of a 25 - cent piece , or it may be a ...
... fruit jar and a shallow pan containing water . The phosphorus is put on a holder that reaches about halfway up the jar . The holder may be a strip of " tin " with a horizontal top about the size of a 25 - cent piece , or it may be a ...
Σελίδα 37
... fruit jars with rubber rings and tight covers make excellent storage vessels for gases . When we have collected enough oxygen , or when all has come off that will , we remove the delivery tube from the water ; then , and not until then ...
... fruit jars with rubber rings and tight covers make excellent storage vessels for gases . When we have collected enough oxygen , or when all has come off that will , we remove the delivery tube from the water ; then , and not until then ...
Σελίδα 41
... fruit ? We say they “ decay " or rot . " Decay is another case of slow oxidation . Some kinds of the tiny plants we call bacteria ( cf. § 204 ) bring about the decay ; they use up oxygen in doing so . Have you ever seen a " hotbed ...
... fruit ? We say they “ decay " or rot . " Decay is another case of slow oxidation . Some kinds of the tiny plants we call bacteria ( cf. § 204 ) bring about the decay ; they use up oxygen in doing so . Have you ever seen a " hotbed ...
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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.