Junior ScienceB.H. Sanborn, 1921 - 533 σελίδες |
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Σελίδα xv
... live ? - What parts has a plant ? - How do seeds begin growing ? What are leaves like ? leaves made of ? · plant climb ? work of roots ? What is the work of leaves ? What are stems and buds for ? Why do plants have flowers ? - What are ...
... live ? - What parts has a plant ? - How do seeds begin growing ? What are leaves like ? leaves made of ? · plant climb ? work of roots ? What is the work of leaves ? What are stems and buds for ? Why do plants have flowers ? - What are ...
Σελίδα 7
... live . We may think that the comforts we now enjoy have always been here ; our great - grandparents , if they were living , could tell a different story . They would tell of a time when such common things as glass and soap were ...
... live . We may think that the comforts we now enjoy have always been here ; our great - grandparents , if they were living , could tell a different story . They would tell of a time when such common things as glass and soap were ...
Σελίδα 9
... live long and useful lives . 6. What We Have Learned . - Science begins with common - sense answers to questions regarding nature . Nature includes objects and phenomena . Phenomena are changes , or happenings , in objects . The objects ...
... live long and useful lives . 6. What We Have Learned . - Science begins with common - sense answers to questions regarding nature . Nature includes objects and phenomena . Phenomena are changes , or happenings , in objects . The objects ...
Σελίδα 26
... lives every year and enormous sums in property , yet without it man would be poor indeed . A proverb says : " Fire is a good servant , but a bad master . " 26 CHAPTER IV Fire What does fire mean to us? How are fires started? How does a ...
... lives every year and enormous sums in property , yet without it man would be poor indeed . A proverb says : " Fire is a good servant , but a bad master . " 26 CHAPTER IV Fire What does fire mean to us? How are fires started? How does a ...
Σελίδα 49
... live ? Can we answer this tion by an experiment ? The experiment ( Fig . 32 ) is to let green plants , in the presence of sunlight , act upon water containing carbon dioxide . ques- water becomes " milky " from the carbon di- oxide you ...
... live ? Can we answer this tion by an experiment ? The experiment ( Fig . 32 ) is to let green plants , in the presence of sunlight , act upon water containing carbon dioxide . ques- water becomes " milky " from the carbon di- oxide you ...
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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.