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The Earth rotates on its axis once every _____.

Summer Solstice

In the northern hemisphere, the _____ occurs on June 21 or 22.


When the sun is at its most northern or southern position from the equator.


When the sun is directly over the equator.

Full moon

When the surface of the moon that faces the Earth is lit up, there is a _____.


_____ are dark-colored, relatively flat regions of the moon's surface formed when interior lava filled large basins.

Solar eclipse

A _____ occurs when the moon moves directly between the sun and Earth and casts a shadow on the Earth.


The imaginary line around which Earth spins is called its _____.


The yearly orbit of earth around the sun is called its _____.


In the northern hemisphere, the winter solstice occurs when the sun reaches its furthest point _____.

Waning crescent

The phase of the moon that immediately precedes the new moon is the _____.


More of the lighted surface of the moon is facing Earth.

Lunar eclipse

A _____ occurs when the moon travels into the Earth's shadow.

New moon

Phase in which the lit side of the moon is facing away from the Earth.

Spring equinox

_____ occurs on March 20 or 21 in the northern hemisphere.


The _____ are caused by the tilt of the Earth.

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