Question

Salty water seen flowing on Mars, not far from Curiosity rover
NASA's Mars Reconnaissance Orbiter has captured the strongest evidence yet that salty liquid
water flows on the planet's surface during warm seasons.
Whether or not these salty flows could sustain life depends on how salty they are, says Lujendra Ojha, of the
Georgia Institute of Technology in Atlanta, who has reported the findings, along with his colleagues. If the water
is completely saturated with perchlorates (hydrated salts), then life as we know it on Earth wouldn't be able to
survive in that sort of concentrated water, he says. But if the water only has a tiny percentage of perchlorates in
it, then I think we should be fine. Recurring slope lineae - dark streaks that appear, get longer, and fade in each
Martian year - have long been thought to represent signs of flowing water. Now that idea has been backed up
by data from the Orbiter's onboard spectrometer, named CRISM, which analyses reflected sunlight to detect
patterns that indicate what minerals are present on the surface.
Salts can absorb water from the atmosphere and lower the freezing point of water, making it
possible for liquid water to exist even in the cold Martian climate Spectral data from four locations with recurrent
slope lineae reveal the presence of hydrated salts, which are most likely to be magnesium perchlorate,
magnesium chlorate and sodium perchlorate. [...]
SALTY water seen flowing on Mars, not far from Curiosity rover. New Scientist, 28 set 2015. Disponível
em: <https://www.newscientist com&gt.
Acesso em: 8 out 2015.
3. Conforme o texto, a existência de sais em Marte:
A) É, provavelmente, o fator responsável pela possível presença de água em Marte, visto que eles podem absorver
água da atmosfera.
B) Sugere que o planeta abrigou muito tempo atrás uma quantidade de água muito semelhante à encontrada na
Terra
C) Promove o congelamento da água em determinadas épocas do ano, impedindo que ela flua livremente o tempo
todo.
D) Comprova a total ausência de água doce no planeta, o que impediria o desenvolvimento de formas de vida mais
evoluidas.
E) Impede a mudança de estado da água no planeta, garantindo, assim, a sua presença sempre na forma liquida.​

Answer 1

Resposta:

Letra E

Explicação:

Se você se atentar ao que o texto informa no segundo paragrafo em que diz "Salts can absorb water from the atmosphere and lower the freezing point of water, making it possible for liquid water to exist even in the cold Martian climate"