A idade da terra

in #science6 years ago

A Terra tem aproximadamente 4470 milhões de anos, com uma margem de erro de pouco menos de 1% (isto é, aproximadamente, de ± 44,7 milhões de anos). Os cientistas estimaram, com base na massa e luminosidade do sol em relação a outras estrelas, a formação da Terra e outros corpos sólidos no sistema solar ocorreu ao mesmo tempo, assim que as medições para calcular a idade da Terra eles foram realizados observando outros corpos presentes no Sistema Solar.

Isso é necessário porque o material rochoso mais antigo da Terra foi modificado ou destruído pela ação das placas tectônicas e, portanto, pela dificuldade em calcular sua idade. Se existe alguma rocha na Terra que é de sua formação e permanece em seu estado original, ela ainda não foi descoberta.

De qualquer forma, se você tiver encontrado em todos os continentes na Terra rochas antigas de mais de 3.500 milhões de anos, sendo o mais velho de uma formação rochosa localizada no Canadá, chamado gnaisse Acasta, estimadas em 4.200 milhões de anos. A medição destas e outras rochas de idade similar é consistente com a estimativa da idade da Terra, assumindo que estas rochas foram depositadas bem depois da origem da Terra.

O estudo de corpos do Sistema Solar, como meteoritos ou rochas lunares, e outras amostras minerais ricas em urânio, foi o que permitiu fazer a estimativa da idade da Terra, e para este estudo foi utilizado o método de datação radiométrica. , que consiste em medir as proporções de um isótopo e outro elemento químico que descende dele na amostra.

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