1. Copyright © 2011 InteractiveScienceLessons.com™ Comets & Asteroids What they are Where they are They and us

2. Copyright © 2011 InteractiveScienceLessons.com™ COMETS-WHAT THEY ARE  A huge ball of mostly ________ ________.  Their size ranges between ___ and ____ miles wide. There are ___________ in our solar system. FROZEN WATER 1 200 TRILLIONS

3. Copyright © 2011 InteractiveScienceLessons.com™ COMETS-WHERE THEY ARE  Most comets are found in the ______ Cloud, which is about ________ further out than the earth is from the sun.  A few orbit among the 8 __________.  A _________________ ____ or ___________ is what sends some into the inner solar system among the planets. OORT 75,000X PLANETS GRAVITATIONAL TUG COLLISION

4. Copyright © 2011 InteractiveScienceLessons.com™ COMETS-THEY AND US  A comet too close to the sun will begin to die as it sheds small fragments due to _______ _____ passing over it. This is how the _____ forms.  If the Earth later passes through this, a phenomenon we call _________ _________ occurs.  There are ____ major meteor showers that occur throughout the year. SOLAR WIND TAIL METEOR SHOWER 14

5. Copyright © 2011 InteractiveScienceLessons.com™ ASTEROIDS-WHAT THEY ARE  Asteroids are mostly _____ ______. IRON ROCK

6. Copyright © 2011 InteractiveScienceLessons.com™ ASTEROIDS-WHAT THEY ARE  Most asteroids harmlessly _______ the sun between _______ and _________.  They will never gather into a planet because of Jupiter’s _________.  A few have been nudged ORBIT MARSJUPITER GRAVITY

7. Copyright © 2011 InteractiveScienceLessons.com™ ASTEROIDS-THEY AND US  There are ___________ asteroids that cross earth ’ s orbiting route that are at least 10 meters across or larger.  A ____________ _______ sized asteroid collides with earth about every ______ years.  Asteroid ____, some ____ miles wide, is thought to be what caused the ____________ extinction. 10,000,000 FOOTBALL FIELD 1,000 KT6 DINOSAUR

8. Come back and visit InteractiveScienceTeacher.com for everything you need for every lesson: Videos- where I show you how to present each lesson PowerPoints Teacher Notes Student Handouts