The acidity levels of the early oceans were much lower than ...

[nevelica]

The acidity levels of the early oceans were much lower than today, so it took 4 billion years of weathering in order to reach the level of salinity present in the oceans today.
 
  Indicate whether this statement is true or false.

Question 2

Scientific knowledge of many events of the Precambrian is limited because ________.
 
  A) metamorphism altered and deformed many rocks
  B) plate tectonics consumed many of the oldest tectonic plates
  C) many ancient rocks have been eroded
  D) any ancient rocks have been covered by a mantle of sediments
  E) metamorphism, plate tectonics, erosion, and sediments account for the limited knowledge of Precambrian events

[enass]

Answer to Question 1

Thank you for answering this question.

Answer to Question 2

Answer: E

[nevelica]

Excellent

[ryhom]

YES! Correct, THANKS for helping me on my review