Acid rain and Limestone

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 2. Water falling from clouds (4)
  2. 5. A sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals (9)
  3. 6. State of matter that fills any space, like air (3)
  4. 8. A heavy odorless colorless gas formed during respiration and by the decomposition of organic (13)

Down

  1. 1. A state of deterioration in metals caused by oxidation or chemical action (9)
  2. 3. A process in which one or more substances are changed into others (8)
  3. 4. Undesirable state of the natural environment being contaminated with harmful substances as (9)
  4. 7. Any of various water-soluble compounds having a sour taste and capable of turning litmus red (4)