Match the words on the left with their definitions on the right.  The tiles in the right-hand column are sortable.  ANSWERS 
      
        
          
            
              
                - compound
 
                - inflammable
 
                - stalagmite
 
                - malleable
 
                - refract
 
                - catalyst
 
                - zenith
 
                - repel
 
                - celestial
 
                - radiation
 
              
             
            
              
                - make light change direction when it goes through at an angle
 
                - the highest point that is reached by the Sun or the Moon in the sky
 
                - a substance which is easily set on fire
 
                - present an opposing force to, push back or away from by a force
 
                - a metal or substance that is easy to press into different shapes
 
                - the process in which energy is emitted as particles or waves
 
                - a substance containing atoms from two or more elements
 
                - relating to the sky or heaven
 
                - a piece of rock pointing upwards from the floor of a cave
 
                - a substance that makes a chemical reaction happen faster