G4 rev term1

Many factories discharge their_____and chemical wastes to rivers and seas.

• sewage

• incinerators

• landfills

    It is hard to find________ when you write about ancient civilizations.                    

• secondary sources

• paintings

• primary sources

      Many records are hard to obtain because they are inscriptions on_________

• papers

• landfills

• tombstones

     It is hard to find primary sources because many records were__________

• water pollution

• lost or burned

• read

    Plastic, paper and glass are_________ that can be recycled.

• landfills

• metals

• materials

    _____________is processing waste material, so that they can be used again.

 ​ ​ (a)  

• recycling

• burning

• incinerators

     ______________are things such as Clothing and furniture that people used long ago.​ (a)  

• artifacts

• tombstones

• paintings

  One way to decrease_________​ is to Check oil tankers regularly.​ (a)  

• water pollution

• air pollution

• incinerators

  ____________are big ovens and produce toxic gases into the air.                                                                                      ​ (a)  

• incinerators

• landfills

• tombstones

____________are always outside the city.​ (a)  

• landfills

• air pollution

• water pollution