The ________ cycle of the phases of the Moon is due to the Moon's spherical shape and the ______ shining on it from different directions.
a. monthly; Earth
b. yearly; Earth
c. monthly; Sun
d. yearly; Sun
Question 2An eclipse of the Moon (lunar eclipse) as seen from Earth, happens when
a. the hot luminous Moon suddenly cools and stops emitting light.
b. the Moon passes between Earth and the Sun.
c. the Earth is between the Moon and the Sun.
d. the Moon is 90 degrees from the direction of the Sun.
Question 3The vernal equinox is the point on the sky where the Sun crosses the ____________ going north and east.
a. north celestial pole
b. south celestial pole
c. celestial equator
d. horizon
Question 4If the Earth's period of rotation were halved, but the period of revolution about the Sun stayed the same,
a. the night would be twice as long.
b. the night would be half as long.
c. the year would be half as long.
d. the year would be half as long.
e. the length of the day would be unchanged.
Question 5In the Milankovitch theory, the elliptical shape of the Earth's orbit, its axis tilt, and axis precession vary with time. These combined at times to create ____ on Earth.
a. day and night
b. seasonal temperature variations
c. daily temperature variations
d. ice ages
e. the constellations
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