Ciencias Sociales, tema 1: La Tierra es un planeta

Science

  • El Sistema Solar está formado por el  1.              ,   2.                     planetas y cuerpos celestes (satélites, cometas y asteroides). Solo un cuarto de la Tierra es roca sólida y el resto está cubierto de  3.                   .
  1.    Un  4.                         es un cuerpo celeste sin luz propia que gira alrededor de un planeta (como la Luna).

 

 

  • Las  5.                     de la Tierra son tres:

          - 6.                          : parte sólida que forma los continentes e islas.

          - 7.                          : conjunto de las aguas (mares, ríos...).

          - 8.                           : capa de aire que rodea a la Tierra. Tiene gases como el oxígeno.

 

 

La Tierra realiza dos movimientos:

 

          - 9.                          : gira sobre sí misma, en sentido contrario a las agujas del reloj. Dura 24 horas. Provoca el día y la noche.

         - 10.                          : gira alrededor del Sol. Dura 365 días. Produce las estaciones.

 

El eje de la Tierra está  11.                            , por lo que los rayos del Sol no llegan con igual intensidad a todas las partes de la Tierra.

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