1. &

2. EARTH ’ S STRUCTURE Earth has four layers: Earth has four layers: ~ INNER CORE - Solid center - Nickel & Steel - Nickel & Steel ~ OUTER CORE - Hot, thick liquid center around the center around the inner core inner core ~ MANTLE - Hot solid layer that surrounds the outer surrounds the outer core core ~ CRUST - Very thin outer layer of rock that we live on rock that we live on

3. ROTATION  ROTATION on Earth ’ s axis causes… N S E W ~ One complete rotation = DAY & NIGHT ~ Earth rotates eastward ( ) ~ Side facing sun has ____ counter-clockwise ONE DAY ONE DAY (24 hours) NIGHT ~ Side away from sun has _______ DAY

4. REVOLUTION ~ ONE COMPLETE REVOLUTION AROUND THE SUN = ______ ~ EARTH REVOLVES __________________ AROUND THE SUN ~ THE __________ OF THE EARTH CAUSES THE SEASONS ~ Revolution around the sun causes ________ & _____ WINTER N. Hemisphere SUMMER N.Hemisphere SUMMER S.Hemisphere WINTER S.Hemisphere ~ THE HEMISPHERE FACING THE SUN EXPERIENCES ______ _______ ~THE HEMISPHERE AWAY FROM THE SUN HAS _______ NN SS N N S S December 21 June 21 SEASONS YEAR COUNTER-CLOCKWISE ONE YEAR TILT SUMMER WINTER