CONSTRAINT (N)

• Something that restricts though or action
• Constrain (v)

CONTAMINATION (N)

• Being made less clean by a germ or
• hazardous substances
• Contaminate (v)
• Contaminant (n)

DEPLETE (V)

• To greatly decrease the supply of a resource or material
• Deplation (n)

PROLONG (V)

DISPOSE OF (V)

• To throw away;
• To get rid of; to kill
• Dispose dosen't occur without of
• Disposable (adj)
• Disposal (n)

ELEMENTALLY (ADV)

• In term of elements; basically
• Element (n)
• Elemental (adj)

EMISSION (N)

• Sending out from a small space into the genral environment
• A substance discharged into the air
• Followed by OF phrase
• Emit (v)

EXTINCTION (N)

• Complete disappearance;
• The end of existence
• Extinct (adj)

RESERVOIR (N)

• A place where a liquid is collected and stored
• Reserve (v)

SHRINK (V)

• To become reduced in size, amount or value
• Shrinkage (n)
• Shrinkable (adj)

STABLE (ADJ)

• Firm and depandable, showing little change
• Stability (n)
• Stably (adv)