The moon 'circles' the earth, but it isn't a circle, really, it's a big oval, so sometimes the moon is closer to the earth and sometimes it's further away, making it look larger or smaller to us.
La historia de la Tierra no ha sido una evolución gradual desde que nació hace más de 4.500 millones de años, como una bola incandescente, hasta el actual planeta azul lleno de una vida compleja y diversa.
by changing rhe atmospheric pressur
From the time of origin of life on earth has chaged many ways. The earth has also changed from the time of its origin. Both lives on earth itself are dynamic.
Different geolgical phenomena such as volcanic erruptions, tectonic movement etc., have changed the configurations of continents. These changed environment of the continents have affected the lives on the earth.
The Earth is 4.8 billion years old, while the origin of life on the earth is 3.5 billion years old. Gradually these changes have given the chaces of variations, from which the suitable organisms are selected on the earth.
how the earth changes over time
the earth's revolution around the sun
the was a fire ball when it was formed.
it cooled down and the hydrogen gas and oxygen combined to form water.
the earth eventually cooled down and the organic compounds combined to form amino acid.
this developed new microorganisms and after many years due to evolution it become complex animals.
To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.
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Most fossils are found in sedimentary rock. Sedimentary rock is formed by dirt (sand, silt, or clay) and debris that settles to the bottom of an ocean or lake and compresses for such a long time that it becomes hard as a rock.