Which of the following happens during a lunar eclipse?

select one:
a. earth casts a shadow on the moon.
b. the moon casts a shadow on earth.
c. earth stops revolving in its orbit.
d. earth starts revolving around the moon.

a. Earth casts a shadow on the moon.    

Explanation:

Lunar eclipse occurs when Earth comes in between sun and moon. The sunlight falling on moon is blocked by Earth and the shadow of earth falls on moon. This happens on full moon day when sun, earth and moon align in one line.The moon passes through the shadow of earth and appears dark.

Thus, the correct option is a.

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