Details

Title: 18-1 Earth in Space

Description: Earth in Space

Total Flash Cards: 13

Created: 04/30/2009 17:48:36

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Cards in this set:

Term
What is Earth's axis?
 Definition
The imaginary line that passes through Earth's center and comes out on either side of the North and South Pole.
Term
What is rotation?
 Definition
The spinning motion of a planet around it's axis (row, row, row your boat).
Term
What is a revolution?
 Definition
The movement of one object around another object (neighborhood)
Term
What is an orbit?
 Definition
The path of an object as it revolves around another.
Term
Each 24 hour cycle of day and night is called a _____.
 Definition
rotation
Term
What causes day and night?
 Definition
Earth's rotation on its axis.
Term
Why does Earth have seasons?
 Definition
Because its axis is tilted as it moves around the sun.
Term
Each of the 2 days of the year when the sun is overhead at either 23.5 south or 23.5 north is called a _____.
 Definition
solstice
Term
Each of the 2 days of the year when neither hemisphere is tilted toward or away from the sun is called ____.
 Definition
an equinox
Term
The autumn equinox is on what day of the year?
 Definition
September 23.
Term
The vernal equinox (or spring equinox) is on what day of the year?
 Definition
March 21
Term
What is the length of daytime when you are in the midst of an equinox ("equal night")
 Definition
12 hours
Term
During an equinox, which hemisphere is tilted towards the sun?
 Definition
neither