Earth systems resist change but there are times when the system ...

[Brittanyd9008]

Earth systems resist change but there are times when the system can change abruptly or become unstable. This is known as a ________.
 
  A) human mistake
  B) negative feedback loop
  C) equilibrium condition
  D) tipping point
  E) quantum moment

Question 2

The ________ is the environmental sphere that encompasses water in all its forms and locations.
 
  A) lithosphere
  B) hydrosphere
  C) geosphere
  D) atmosphere
  E) biosphere

[soda0602]

Answer to Question 1

Answer: D

Answer to Question 2

Answer: B