Glaciers on Mars! (based on National Geographic Article, January 2004) Do glacia

Question

Glaciers on Mars!

(based on National Geographic Article, January 2004)

Do glacial flows shape the surface of Mars even now? That idea is gaining support among Mars scientists. “These are glaciers – not soil with a little ice in them,” says Phil Christensen. Faint whitish “flow lines,” shown on photographs of the surface of Mars, indicate that glaciers are moving through the valley. More evidence of flowing ice is visible in a cluster of hills. Satellite images that show temperature of the ground indicate a sharp division between cold material flowing off the hills onto the valley floor indicates that material flowed off the hills on a layer of ice.

Question 1: what is the hypothesis suggested in this article?

a. the surface topography of Mars is being shaped by glacial ice

b. ice, in the form of glaciers, existed on mars

c. cold material can be distinguished from warm material on satellite images

d.material flowed from hilltops down to the valley floors on mars

Question 2: about the mars article: what evidence is provided to support the hypothesis of this article?

a. spaceships that landed on mars have identified ice in samples collected

b. white glacial ice has been shown in recent photographs and satellite images of mars

c. scientists could watch material flow off hillsides onto the valley floor.

d. features on satellite images include whitish flow lines and ground temperature indicators, suggesting glaciers are active on the planet.

Explanation / Answer

1. Question: What is the hypothesis suggested in this article?

Answer: D. Material flowed from hilltops down to the valley floors on Mars

Explanation: Mars may look dry but when the glaciers melted, the lines of debris were deposited on the valley floor. This debris converges with other lines of debris.

2. Question: What evidence is provided to support the hypothesis of this article?

Answer: C. Scientists could watch material flow off hillside onto the valley floor

Explanation: Several photographed geological features also point to the presence of glaciers. Moving glaciers are the accepted source of these rock deposits and the glaciers left some shaped patterns, a clear evidence that they flowed down mountainsides.

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