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As dunas de areia que cantam sozinhas no deserto Algumas dunas fazem um som grave e alto - o 'canto das dunas' - quando a areia desliza pela encosta. Isso exige graos bem uniformes, do mesmo tamanho e secos: ao deslizarem juntos, eles vibram na mesma hora e a vibracao vira um som so, as vezes tao alto quanto um aviao. Por isso so algumas dunas no mundo conseguem cantar. #Dunas #Deserto #Ciencia #Geologia #Natureza
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A poeira do Saara que atravessa o oceano e alimenta a Amazônia Todo ano, milhoes de toneladas de poeira do deserto do Saara sao levadas pelo vento atraves do Atlantico ate a Amazonia. A poeira carrega fosforo, um adubo natural que repoe o que as chuvas lavam do solo da floresta. Boa parte vem de um antigo leito de lago seco. O deserto seco alimenta a floresta cheia de vida - dois opostos ligados pelo vento. #Saara #Amazonia #Natureza #Clima #Ciencia
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