rochas minerais e as actividades humanas
TRANSCRIPT
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Antigamente o Homem começou
por usar qualquer pedra que tivesse
uma forma que lhe pudesse servir
como arma de caça ou de defesa.
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Mas depressa teve de
escolher materiais que
possuíssem características
mais adequadas ao uso
que pretendia dar-lhes.
Ex. Sílex
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O homem pré-histórico, para cobrir
as suas necessidades, fez uso do
sílex e outras variedades de quartzo.
Nas sociedades neolíticas, o homem
usou gemas ( minerais utilizados em
joalharia e ourivesaria ) como
moeda de troca. Quando descobriu
os metais ( ouro, cobre, estanho,
ferro ) passou a fazer uso deles.
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O conhecimento dos metais e a sua
utilização caracterizou alguns
períodos da antiguidade, como a
Idade do bronze ou a Idade do ferro.
Actualmente, o homem faz uso
directo ou indirecto de quase todos
os minerais conhecidos, mais de
2.600 espécies minerais.
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Os dólmenes
são
monumentos
simples,
construídos
na
Antiguidade
para sepultar
os mortos.
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Actualmente, o Homem utiliza
as rochas e os minerais em
diferentes actividades, das quais
se podem salientar a obtenção
de energia, a construção civil, a
indústria e a produção artística.
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Os carvões são uma importante
fonte energética (foi a primeira
utilizada a grande escala).
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O granito é utilizado na construção
civil.
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Os calcários
podem ser
utilizados no
calcetamento de
passeios ou na
produção de
materiais como
cimento e betão.
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O bronze pode ser utilizado para a
elaboração de estátuas.
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O mármore pode ser utilizado na
decoração como na elaboração de
estátuas.
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A argila e o
barro podem
ser utilizados
em indústrias
como a
cerâmica.
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A areia, quando atinge temperaturas
muito elevadas (1250 ºC)
transforma-se em vidro.
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Alguns minerais como o ouro, a
prata, o diamante, as safiras entre
outros são utilizados no fabrico de
peças de joalharia.
Esta moeda de ouro vale 6 milhões de dólares
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Relógio mais
caro de 2005
1,5 milhões de
dólares.
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