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Nature Nivel B1


Los Angeles (USA) / The rotation of the Earth on its own axis is now less stable due to “a lateral overload” by increasing the melting of the poles, said the National Aeronautics and Space Administration (NASA).

Due to global warming, caused in part by human action, the Greenland ice sheet has melted by an equivalent weight of 7,500 gigatons which have gone into the ocean, affecting the stability of Earth’s rotation and making it “to sway”.

According to the research presented by NASA’s Jet Propulsion Laboratory (JPL), the displacement of this mass is one of the important factors that affect the stability of Earth’s rotation.

“A mass that is at 45 ° in relation to the North Pole -which is Greenland- or in relation to the South Pole -like the glaciers of Patagonia-, when moving will have a greater impact in modifying the axis on which the earth revolves. a mass that is right next to the pole, “Eric Ivins, JPL researcher and co-author of the study, said today in a statement.

The displacement of the ice masses is one of the three factors that the researchers point as causing the most unstable turn and the displacement of the Earth’s axis of rotation.

Another has to do with the “emergence” of the rocks in the area where there was previously an ice sheet and that are no longer under the pressure of that weight.

A third cause presented by the experts is the so-called “mantle convection”, caused by the movements of the molten rocks that are at very high temperatures in the depths of the earth.

According to the analysis, the layer that lies between the core and the surface (mantle) can undergo variations with the movements of elevation or descent of the incandescent rock, which also generates instability in its rotation and modifies its axis.

When analysing the measurements made during the 20th century, JPL calculated that the axis of rotation of the earth was displaced approximately four inches (10 centimetres) per year, which throughout the century represented about 10 metres. (September 26, 2018, EFE/Practica Español)

News related in video (March 2018):

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Question 1
En el texto se dice que...  
no se ha registrado ninguna anomalía en relación con la rotación de la Tierra.
los científicos creen que la Tierra podría 'bambolearse' a causa del cambio climático.
el deshielo de los polos está afectando a la rotación de la Tierra.
Question 2
En la noticia se dice que...  
la Tierra se 'bambolea' porque hay zonas donde ahora hay más peso que antes.
el deshielo en Groenlandia está evitando que se produzcan cambios en la rotación de la Tierra.
el desplazamiento de una masa no es la causa de que la Tierra se 'bambolee'.
Question 3
Según la noticia...    
el deshielo es el único motivo por el cual la Tierra está rotando de forma más inestable.
el deshielo no es la única causa de que la Tierra esté rotando de forma menos estable.
se descarta que haya otras causas que expliquen que la Tierra esté rotando de forma más inestable.
Question 4
Según los expertos...  
descartan que los movimientos de las rocas fundidas esté afectando a la rotación del planeta.
están "apareciendo" rocas donde antes solo había hielo.
cada vez hay menos zonas rocosas en el planeta Tierra.
Question 5
El eje de rotación de la Tierra...  
puede desplazarse a causa del desplazamiento de las masas de hielo.
jamás se podrá desplazar aunque haya un desplazamiento de las masas de hielo.
se desplazó antes de que se derritiera el hielo de los polos.
Question 6
En el vídeo se dice que...  
cada vez hay más hielo en la Antártida.
no se han registrado cambios en el hielo antártico.
hay menos hielo en la Antártida.
Question 7
Según el vídeo, el hielo marino es irrelevante en el sistema climático global.    
En absoluto.
No se sabe.
Así es.
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