Junior ScienceB.H. Sanborn, 1921 - 533 σελίδες |
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Σελίδα x
... Soil CHAPTER XVI · What is the earth's crust ? What are the classes of rocks ? - How are stratified rocks formed ? What are fossils ? How are unstratified rocks formed ? - What is weathering ? How do plants cause weathering ? How does ...
... Soil CHAPTER XVI · What is the earth's crust ? What are the classes of rocks ? - How are stratified rocks formed ? What are fossils ? How are unstratified rocks formed ? - What is weathering ? How do plants cause weathering ? How does ...
Σελίδα xi
... soil ? - Why must soil be tilled ? What is irrigation ? - Do crops rob the soil ? - How can soil be kept fertile ? Exercises . Why should crops be rotated ? - ― - PAGE CHAPTER XVII Minerals and Metals . What are minerals ? Is iron ...
... soil ? - Why must soil be tilled ? What is irrigation ? - Do crops rob the soil ? - How can soil be kept fertile ? Exercises . Why should crops be rotated ? - ― - PAGE CHAPTER XVII Minerals and Metals . What are minerals ? Is iron ...
Σελίδα 3
... soil is formed , why grass is green , how we are nourished by our food ? There seems to be no end to the questions you can ask yourself regarding the objects you see and what happens to them . So far as we know , men have always ...
... soil is formed , why grass is green , how we are nourished by our food ? There seems to be no end to the questions you can ask yourself regarding the objects you see and what happens to them . So far as we know , men have always ...
Σελίδα 31
... soil , but it is so . FIG . 19. The phosphorus burns until it has used up that part of the air which permits burning to go on . Let the teacher set up the apparatus of Fig . 19. The vessels needed are a pint fruit jar and a shallow pan ...
... soil , but it is so . FIG . 19. The phosphorus burns until it has used up that part of the air which permits burning to go on . Let the teacher set up the apparatus of Fig . 19. The vessels needed are a pint fruit jar and a shallow pan ...
Σελίδα 41
... soil in some places red ? 66 5. Of what are tin " dishes made ? Test one with a magnet . 6. Examine an old washboard ; what is the color of zinc rust ? Why is zinc used for washboards instead of iron or copper ? 7. Covering wood with an ...
... soil in some places red ? 66 5. Of what are tin " dishes made ? Test one with a magnet . 6. Examine an old washboard ; what is the color of zinc rust ? Why is zinc used for washboards instead of iron or copper ? 7. Covering wood with an ...
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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.