One hypothesis relates the formation of Chasma Boreale to underlying volcanic activity.

有一种猜测认为博勒拉峡谷的成形与火山的地下活动有关。

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One hypothesis relates the formation of Chasma Boreale to underlying volcanic activity .

目前的说法是地下的火山活动导致了大峡谷的形成。

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The northern ice cap on Mars is nearly divided into two by a huge division named Chasma Boreale.

火星北半球的冰冠几乎被宏伟的博勒拉峡谷一劈为二。

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They were photographed in September 1998 in Chasma Boreale, a giant trough at Mars' north polar cap.

CNN: Scientists debate implications of Mars pictures