地理上册（Geographical days）.docVIP

地理上册（Geographical days） 1. The shape and size of the earth: in 1519-1522, the fleet of Portuguese navigator Magellan, first realized the voyage of the world and confirmed that the earth was a sphere. Earth is an irregular sphere with a slightly flat and equatorial bulge: the average radius of the earth is 6371 kilometers, the polar radius is 6357 kilometers, the equatorial radius is 6378 kilometers, and the equatorial circumference is 40 thousand kilometers. The surface area is 551 million square kilometers. 2. Definition: a circle that is perpendicular to the earth axis and circles the earth for a week. Features: the shape is round; Length is not equal, the longest parallel is the equator. The filling indicates the direction of the object. The equator is the zero parallel of the globe, the dividing line between the northern and southern hemispheres. Is the earths longest parallel, tropic of Capricorn (23.5 ° S) is the boundary between the tropical and south temperate zone. The tropic of cancer (23.5 ° N) is the boundary between the tropical and north temperate zone. Antarctic circle (66.5 ° S) is the south temperate zone and south frigid zone dividing line, the Arctic Circle (66.5 ° N) is the boundary between the north temperate and boreal zones. 4. Meridian: definition: a semicircle that connects the north and south poles and intersects the parallel. Features: the shape is half round; The length is equal; Give directions to the north and south. 5, important meridian: 0 ° on the prime meridian is a globe meridian, 20 ° W and 160 ° E of the coil is the earth the boundary between the two hemispheres. The role of the warp web: determine the position of any point on the earths surface. 6. The rotation and rotation of the earth Earth movement The axis of rotation The direction of cycle The geographical phenomenon Since the turn The earths axis From west to east One day Diurnal change and time difference Turn the male The sun From west to east A year The four seasons cha