. A complete geography. beyond the north pole, and therefore the Arctic Circle is located 23^° from the pole. On December 21 the earths revolution has caused the north pole to turn away from the sun, and the vertical rays then fall 23^° south of the equator, while the sunlight reaches the same distance beyond the south pole. Thus the Tropic of Capricorn and the Antarctic Circle are lo-cated. It is plain, therefore, that the inclination of the earths axis determines the exact bound-aries of the zones. A map of thezones. Make a drawing similarReview Questions. — (1) What is to this. a star ? (2
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. A complete geography. beyond the north pole, and therefore the Arctic Circle is located 23^° from the pole. On December 21 the earths revolution has caused the north pole to turn away from the sun, and the vertical rays then fall 23^° south of the equator, while the sunlight reaches the same distance beyond the south pole. Thus the Tropic of Capricorn and the Antarctic Circle are lo-cated. It is plain, therefore, that the inclination of the earths axis determines the exact bound-aries of the zones. A map of the~zones. Make a drawing similarReview Questions. — (1) What is to this. a star ? (2) Give some idea of the dis-tance of the stars from us. (3) What is a planet? (4) Name the eight planets.(5) Mention some points of similarity among them. (6) What is the distance ofthe earth from the sun ? (7) Give some idea of the size of the earth comparedwith that of the sun. (8) How has theearths crust been formed, with its conti-nents and ocean basins ? (9) What is the extent and position of the land surface ?. THE EARTH AS A PLANET 257 earth-s inovement rl8> Tn wh, t ^- What was formei-Iy believed about theab„„t variatio, of 4tt td heat 7 a- %1 - • ^*^ ^ellAmerica, (c) at your home riorwbl! TA ! ^*°- <» Centralwere „eve, -inclined 18 If he north nnT , °*° ^ f ^fi, ^^ ^i• U»; VMiat is the real posi- (20) What deterniin:: thie .g^ : yr ^T Wr^^ ^^ ^^^^ ^^^^^rapid movement of the earth? (22)ZJml:J 1 ^hy do we not notice thespace? (23) Show how the revolution of ff ^ ^^^ ^^^8 ^^ i*^ other, to k Lned toward ^hsTrA/ llL! ttT . ^^? *^ ^^(25) What is the earths orbit? (26)%Vhat L t^^^^^^ (27) How are we affected by theslpLIx^s h f th v° ^g^ wf .f smis rays less intense when the sun is low in +w I ., ^ ^ ^^^^ ^^ *h« day. et. o^Septelr^. « rSetl?^r°4 ^^^^^ff °21. (34) How may anoles be measured ?? /q^^M (.^-; lua en ^i. (.:33) Juneinclined. (36) What de.e„.i