Details Title: 18-1 Earth in Space Description: Earth in Space Total Flash Cards: 13 Created: 04/30/2009 17:48:36		New Users: To study from this flashcard set, or to create your own your own study flash cards, REGISTER HERE. Existing Users: CLICK HERE. Additional Science Flashcards
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