Elementary Physiography: An Introduction to the Study of NatureLongmans, Green & Company, 1899 - 427 σελίδες |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 41.
Σελίδα 177
... night is not due to flame , but is only the re- flection on the steam - cloud of the heated lava below . ( 2 ) Fragmental Products . - These consist of the solid materials sent out during an eruption , and are of various sizes and kinds ...
... night is not due to flame , but is only the re- flection on the steam - cloud of the heated lava below . ( 2 ) Fragmental Products . - These consist of the solid materials sent out during an eruption , and are of various sizes and kinds ...
Σελίδα 182
... night the glowing lava may be seen through fissures . Distribution of Volcanoes . 183 153. Errors about Volcanoes . FIG . 135. - Plan and section of a composite volcanic cone . a , tuff ; b , lava ; c , ashes and scoriæ . FIG . 137 ...
... night the glowing lava may be seen through fissures . Distribution of Volcanoes . 183 153. Errors about Volcanoes . FIG . 135. - Plan and section of a composite volcanic cone . a , tuff ; b , lava ; c , ashes and scoriæ . FIG . 137 ...
Σελίδα 210
... night than during the middle of the day , the amount of heat that reaches the earth is made less at these times than at noon . Hence the greater warmth of the sun's rays at midday . It has been estimated that in this way a vertical beam ...
... night than during the middle of the day , the amount of heat that reaches the earth is made less at these times than at noon . Hence the greater warmth of the sun's rays at midday . It has been estimated that in this way a vertical beam ...
Σελίδα 214
... night ; greater in summer than in winter . In severe frosts , indeed , the tempera- ture may rise with height , instead of falling , all the cold dense air remaining in the lowlands beneath . We thus see that the lower temperature of ...
... night ; greater in summer than in winter . In severe frosts , indeed , the tempera- ture may rise with height , instead of falling , all the cold dense air remaining in the lowlands beneath . We thus see that the lower temperature of ...
Σελίδα 215
... night . sea breezes . These occur chiefly on the coasts of tropical countries , though they are also found during warm weather in our own islands , when not overpowered by a strong general wind . They are more frequent about islands and ...
... night . sea breezes . These occur chiefly on the coasts of tropical countries , though they are also found during warm weather in our own islands , when not overpowered by a strong general wind . They are more frequent about islands and ...
Συχνά εμφανιζόμενοι όροι και φράσεις
acid altitude angle Antarctic Antarctic Circle Arctic Arctic Circle Atlantic atmosphere axis barometer body calcium carbonate called carbon celestial equator celestial sphere centre circle coast currents declination delta density deposits depth distance earth earth's orbit east ecliptic equal equator equatorial equinox evaporation Experiment fall fathoms feet flask force glacier globe heat Hence horizon inches increase iron land latitude lava length liquid magnet mass mercury meridian miles moon motion mountain move needle night north pole Northern Hemisphere OCEAN oxide oxygen parallel particles passing plane position pressure quantity rain rays regions right ascension rise river rocks rotation round side sidereal day silica solar day specific gravity spring stars stream substance sun's surface temperature thermometer Tropic Tropic of Cancer Tropic of Capricorn tube valley vapour velocity vernal equinox vertical volcano weight winds winter zenith
Δημοφιλή αποσπάσματα
Σελίδα 20 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Σελίδα 37 - Every body continues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state.
Σελίδα 313 - A circle is a plane figure contained by one line, which is called the circumference, and is such, that all straight lines drawn from a certain point within the figure to the circumference are equal to one another.
Σελίδα 415 - All the rivers run into the sea; yet the sea is not full; unto the place from whence the rivers come, thither they return again.
Σελίδα 356 - The Ram, the Bull, the heavenly Twins, And next the Crab the Lion shines, The Virgin and the Scales ; The Scorpion, Archer and He-goat, The Man that holds the watering-pot And Fish with glittering tails.
Σελίδα 317 - The zenith distance of a body is its angular distance from the zenith, measured on the vertical circle passing through the body from 0° to 90°. It is the complement of the altitude.
Σελίδα 258 - When there is not enough of clouds and wind to afford this degree of protection, dew begins to form, and by preventing the temperature of any leaf or flower from sinking below the dew-point, saves them all from destruction, unless, as when hoar-frost appears, the dew-point itself is below the freezing-point.