The Cycle of Night and Day

What causes an equinox?

• Earth's Northern Hemisphere is tilted toward the sun. 
• Earth's Northern Hemisphere is tilted away from the sun.
• Earth's Northern Hemisphere is neither tilted toward or away from the sun. 

Which best describes winter in the north pole?

• The sky is light 24 hours a day.
• The days are about four times longer than the nights.
• The days are about four times shorter than the nights.
• The sky is dark 24 hours a day. 

Which best explain why it is dark during the winter at the north pole?

• Earth's north pole is tilted toward the sun.
• Earth's north pole is tilted away from the sun.
• Earth's north pole is neither tilted toward or away from the sun.

Which best explains winter solstice in the Northern Hemisphere?

• The day is shorter than any day in the year. 
• The day is longer than any day in the year. 
• The day is short and will get shorter throughout the rest of the season.
• The day is long and will get longer throughout the rest of the season.

What best explains what occur during the winter solstice.

• Earth's Northern Hemisphere is tilted toward the sun.

• Earth's Northern Hemisphere is neither tilted toward or away from the sun.

• Earth's Northern Hemisphere is tilted away from the sun.

Which would best model rotation?

• a pinwheel spinning
• a spring shortening and lengthening
• a window moving up and down
• a tethered ball making circle around a pole

Which best explains rotation?

• The object is sliding back and forth.

• The object is contracting and expanding.

• The object is spinning on an axis.

• The object is moving around another object.

Which statement about Earth's revolution is true?

• Earth takes about 24 hours to complete one revolution.
• Earth takes about 28 days to complete one revolution.
• Earth takes about 365 days to complete one revolution.
• Earth takes about 48 hours to complete one revolution.

Which best explains why the South Pole receives no sunlight at all during nearly half the year?

• Earth's South Pole is not able to absorb slanted rays of sunlight.

• Earth's South Pole is covered in thick clouds that part of the year.

• Earth's South Pole is tilted away from the sun at that time of year.

• Earth's South Pole is hidden by the moon during that part of the year.

Which would best model revolution?

• A seesaw tottering
• a car tire spinning
• an elevator moving up and down
• a person moving in circles on a carousel